los angeles , california -lrb- cnn -rrb- -- christina aguilera signed her name to a divorce petition that was filed against husband jordan bratman in los angeles county superior court on thursday . the 29-year-old singer-actress cited `` irreconcilable differences '' as the cause of the split from the 33-year-old music executive she married five years ago . aguilera 's petition said a prenuptial agreement should dictate how they separate their assets . that agreement called for jordan to get none of the money aguilera earned before , during or after their marriage . she is asking the judge to grant joint legal and physical custody of the couple 's 2-year-old son , max . `` although jordan and i are separated , our commitment to our son max remains as strong as ever , '' aguilera said in a statement released tuesday through her representative . -lrb- mashable -rrb- -- apple 's production partners are already hard at work on the new model of ipad , according to a report in the wall street journal . the fact that apple is working on an ipad 2 , of course , is common knowledge . the famously tight-lipped company rarely talks about upcoming product launches , and is n't talking now . but apple has never denied that it intends to follow up on one of its most successful products . nearly $ 5 billion worth of ipads have been sold in the three quarters since its launch . and a quick glance at the history of the iphone , which launches a new model every year , suggests that we should expect to see the ipad 2 right around the first anniversary of its predecessor 's launch : april 3 , 2011 . aguilera co-stars with cher in `` burlesque , '' a major feature film set for a thanksgiving release . by . rachel reilly . many sleep experts blame using mobiles and tablets into the early hours for a bad night 's sleep , but gadgets may not disrupt sleep at all -- so long as you dim the lights and keep it at a safe distance from your face . recent research has shown that led screen disrupts sleep because it stops the body producing the hormone melanin , which responds to light and govern whether we feel sleepy or not . a prototype of the ipad 2 was apparently spotted by a reuters reporter after the launch of news corp 's ipad publication , the daily , last week . and an unconfirmed report from digitimes in december said that foxconn , the chinese makers of the iphone and ipad , had been ordered to manufacture the ipad 2 in market-ready quantities by the end of february . but the new study has found that simply lowering the brightness of a screen and holding the gadget about 12 inches away from the face can stop the light from interfering with a good night 's sleep . smartphones and other gadgets used before bed can cause restless nights because the light causes melatonin suppression - a chemical which controls the body clock . the journal report , which carries three bylines and cites `` people familiar with the matter , '' offers a few more nuggets of detail . it confirms the widely-held belief that the ipad 2 will have a front-facing camera , enabling use of the facetime videoconferencing app . it says that the 3g version will again be available on verizon and at&t , with sprint and t-mobile still shut out . but it contradicts earlier reports that apple will endow the ipad 2 with a higher-resolution screen , much as the iphone 4 had significantly higher resolution than the iphone 3gs . apple is likely still working on a higher quality ipad display -- it just wo n't be ready for the ipad 2 . so will a slightly improved apple tablet with camera be enough to persuade millions of ipad users to upgrade ? are there other bells and whistles we do n't know about yet ? we have previously reported on rumors that the new device will have an sd card slot , and that it will feature rear-facing and front-facing cameras . -lrb- click here for our comprehensive roundup of ipad 2 rumors -rrb- . we 'll know when apple 's acting ceo tim cook takes the stage , if this product timeline is accurate , in a few months ' time . © 2010 mashable.com . all rights reserved . ` in the old days , people would go to bed and read a book . but much more commonly people go to bed and they have their tablet on which they read a book or they read a newspaper or they 're looking at material . ` the problem is it 's a lit device , and how problematic is the light source from the mobile device ? ' co-author dr. lois krahn , a psychiatrist at the mayo clinic in scottsdale in arizona , told medical daily . last month harvard academic and sleep expert professor charles czeisler called for more research into the effects of artificial light after he published an article in journal nature . he said that modern humans are exposed to four times more light than 60 years ago and it was disrupting our sleep patterns . he explained that the decline in the number of hours slept per night is affecting public health , including a greater risk of obesity , diabetes , heart disease , depression and stroke in adults and concentration problems in children . previous studies found that using a phone late at night prevents production of the sleep hormone melanin . now experts say holding the phone close to your face could be the problem . the new study investigated how levels of light emitted from mobile devices at different distances from a user 's face compared to the threshold of light that suppresses the secretion of melatonin , 30 lux . in a dark room , they used a sensitive light meter to measure the light coming from two apple tablets and a smartphone : an ipad 1 , an ipad 3 with retinal display , and an iphone 4 . the emitted light was measured at 0 inches and 14 inches from a user 's face . results . showed that when the brightness was lowered to the minimal setting , the . led lights of all three devices were well below the 30 lux . melatonin-suppressing threshold . ` we found that only at the highest setting was the light over a conservative threshold that might affect melatonin levels , ' said dr. krahn . ` if it 's at the mid setting or at a low setting it 's bright enough to use . ' experts said some gadgets only need the backlight dimmed while other devices such as the ipad 3 require a two-pronged approach to reduce light levels becoming too high . at the lowest brightness setting , held . right up against a user 's face , the iphone 4 's backlight measured only 2 . lux , the ipad 1 measured 11 lux , and the ipad 3 measured 2 lux . held 14 inches away from a user 's face , all the devices measured between 0 and 3 lux at the lowest brightness setting . at the brightest setting measured from the same distance from a user 's face , the iphone 4 measured 275 lux , the ipad 1 measured 124 lux , and the ipad 3 measured 248 lux -- all far above the melatonin-disrupting limit . when held 14 inches away at the brightest setting , the iphone 4 measured 8 lux and the ipad 1 measured 21 lux . the ipad 3 , however , measured 32 lux -- just above the threshold . the results suggest that if you must use your smartphone or tablet before bed , you should either keep the screen brightness at the lowest setting or hold it at least a foot from your face in order to avoid disrupting sleep . if you have a mobile device with a particularly strong backlight , like the ipad 3 , you should do both .
previous studies have shown that led lights in phones disturb production of sleep hormone melanin . but by making simple adjustments you can still get a good night 's sleep . most phones just need dimming but certain gadgets such as the ipad 3 must be held at a distance , say the u.s. researchers .
of the iphone , which launches a new model every year , suggests that we should expect to see the ipad 2 right around the first anniversary of its predecessor 's launch : april 3 , 2011 . aguilera co-stars with cher in `` burlesque , '' a major feature film set for a thanksgiving release . by . rachel reilly . many sleep experts blame using mobiles and tablets into the early hours for a bad night 's sleep , but gadgets may not disrupt sleep at all -- so long as you dim the lights and keep it at a safe distance from your face . recent research has shown that led screen disrupts sleep because it stops the body producing the hormone melanin , which responds to light and govern whether we feel sleepy or not . a prototype of the ipad 2 was apparently spotted by a reuters reporter after the launch of news corp 's ipad publication , the daily , last week . and an unconfirmed report from digitimes in december said that foxconn , the chinese makers of the iphone and ipad , had been ordered to manufacture the ipad 2 in market-ready quantities by the end of february . but the new study has found that simply lowering the brightness of a screen and holding the gadget about 12 inches away from the face can stop the light from interfering with a good night 's sleep . smartphones and other gadgets used before bed can cause restless nights because the light causes melatonin suppression - a chemical which controls the body clock . the journal report , which carries three bylines and cites `` people familiar with the matter , '' offers a few more nuggets of detail . it confirms the widely-held belief that the ipad 2 will have a front-facing camera , enabling use of the facetime videoconferencing app . it says that the 3g version will again be available on verizon and at&t , with sprint and t-mobile still shut out . but it contradicts earlier reports that apple will endow the ipad 2 with a higher-resolution screen , much as the iphone 4 had significantly higher resolution than the iphone 3gs . apple is likely still working on a higher quality ipad display -- it just wo n't be ready for the ipad 2 . so will a slightly improved apple tablet with camera be enough to persuade millions of ipad users to upgrade ? are there other bells and whistles we do n't know about yet ? we have previously reported on rumors that the new device will have an sd card slot , and that it will feature rear-facing and front-facing cameras . -lrb- click here for our comprehensive roundup of ipad 2 rumors -rrb- . we 'll know when apple 's acting ceo tim cook takes the stage , if this product timeline is accurate , in a few months ' time . © 2010 mashable.com . all rights reserved . ` in the old days , people would go to bed and read a book . but much more commonly people go to bed and they have their tablet on which they read a book or they read a newspaper or they 're looking at material . ` the problem is it 's a lit device , and how problematic is the light source from the mobile device ? ' co-author dr. lois krahn , a psychiatrist at the mayo clinic in scottsdale in arizona , told medical daily . last month harvard academic and sleep expert professor charles czeisler called for more research into the effects of artificial light after he published an article in journal nature . he said that modern humans are exposed to four times more light than 60 years ago and it was disrupting our sleep patterns . he explained that the decline in the number of hours slept per night is affecting public health , including a greater risk of obesity , diabetes , heart disease , depression and stroke in adults and concentration problems in children . previous studies found that using a phone late at night prevents production of the sleep hormone melanin . now experts say holding the phone close to your face could be the problem . the new study investigated how levels of light emitted from mobile devices at different distances from a user 's face compared to the threshold of light that suppresses the secretion of melatonin , 30 lux . in a dark room , they used a sensitive light meter to measure the light coming from two apple tablets and a smartphone : an ipad 1 , an ipad 3 with retinal display , and an iphone 4 . the emitted light was measured at 0 inches and 14 inches from a user 's face . results . showed that when the brightness was lowered to the minimal setting , the . led lights of all three devices were well below the 30 lux . melatonin-suppressing threshold . ` we found that only at the highest setting was the light over a conservative threshold that might affect melatonin levels , ' said dr. krahn . ` if it 's at the mid setting or at a low setting it 's bright enough to use . ' experts said some gadgets only need the backlight dimmed while other devices such as the ipad 3 require a two-pronged approach to reduce light levels becoming too high . at the lowest brightness setting , held . right up against a user 's face , the iphone 4 's backlight measured only 2 . lux , the ipad 1 measured 11 lux , and the ipad 3 measured 2 lux . held 14 inches away from a user 's face , all the devices measured between 0 and 3 lux at the lowest brightness setting . at the brightest setting measured from the same distance from a user 's face , the iphone 4 measured 275 lux , the ipad 1 measured 124 lux , and the ipad
max remains as strong as ever , '' aguilera said in a statement released tuesday through her representative . -lrb- mashable -rrb- -- apple 's production partners are already hard at work on the new model of ipad , according to a report in the wall street journal . the fact that apple is working on an ipad 2 , of course , is common knowledge . the famously tight-lipped company rarely talks about upcoming product launches , and is n't talking now . but apple has never denied that it intends to follow up on one of its most successful products . nearly $ 5 billion worth of ipads have been sold in the three quarters since its launch . and a quick glance at the history of the iphone , which launches a new model every year , suggests that we should expect to see the ipad 2 right around the first anniversary of its predecessor 's launch : april 3 , 2011 . aguilera co-stars with cher in `` burlesque , '' a major feature film set for a thanksgiving release . by . rachel reilly . many sleep experts blame using mobiles and tablets into the early hours for a bad night 's sleep , but gadgets may not disrupt sleep at all -- so long as you dim the lights and keep it at a safe distance from your face . recent research has shown that led screen disrupts sleep because it stops the body producing the hormone melanin , which responds to light and govern whether we feel sleepy or not . a prototype of the ipad 2 was apparently spotted by a reuters reporter after the launch of news corp 's ipad publication , the daily , last week . and an unconfirmed report from digitimes in december said that foxconn , the chinese makers of the iphone and ipad , had been ordered to manufacture the ipad 2 in market-ready quantities by the end of february . but the new study has found that simply lowering the brightness of a screen and holding the gadget about 12 inches away from the face can stop the light from interfering with a good night 's sleep . smartphones and other gadgets used before bed can cause restless nights because the light causes melatonin suppression - a chemical which controls the body clock . the journal report , which carries three bylines and cites `` people familiar with the matter , '' offers a few more nuggets of detail . it confirms the widely-held belief that the ipad 2 will have a front-facing camera , enabling use of the facetime videoconferencing app . it says that the 3g version will again be available on verizon and at&t , with sprint and t-mobile still shut out . but it contradicts earlier reports that apple will endow the ipad 2 with a higher-resolution screen , much as the iphone 4 had significantly higher resolution than the iphone 3gs . apple is likely still working on a higher quality ipad people would go to bed and read a book . but much more commonly people go to bed and they have their tablet on which they read a book or they read a newspaper or they 're looking at material . ` the problem is it 's a lit device , and how problematic is the light source from the mobile device ? ' co-author dr. lois krahn , a psychiatrist at the mayo clinic in scottsdale in arizona , told medical daily . last month harvard academic and sleep expert professor charles czeisler called for more research into the effects of artificial light after he published an article in journal nature . he said that modern humans are exposed to four times more light than 60 years ago and it was disrupting our sleep patterns . he explained that the decline in the number of hours slept per night is affecting public health , including a greater risk of obesity , diabetes , heart disease , depression and stroke in adults and concentration problems in children . previous studies found that using a phone late at night prevents production of the sleep hormone melanin . now experts say holding the phone close to your face could be the problem . the new study investigated how levels of light emitted from mobile devices at different distances from a user 's face compared to the threshold of light that suppresses the secretion of melatonin , 30 lux . in a dark room , they used a sensitive light meter to measure the light coming from two apple tablets and a smartphone : an ipad 1 , an ipad 3 with retinal display , and an iphone 4 . the emitted light was measured at 0 inches and 14 inches from a user 's face . results . showed that when the brightness was lowered to the minimal setting , the . led lights of all three devices were well below the 30 lux . melatonin-suppressing threshold . ` we found that only at the highest setting was the light over a conservative threshold that might affect melatonin levels , ' said dr. krahn . ` if it 's at the mid setting or at a low setting it 's bright enough to use . ' 3 measured 248 lux -- all far above the melatonin-disrupting limit . when held 14 inches away at the brightest setting , the iphone 4 measured 8 lux and the ipad 1 measured 21 lux . the ipad 3 , however , measured 32 lux -- just above the threshold . the results suggest that if you must use your smartphone or tablet before bed , you should either keep the screen brightness at the lowest setting or hold it at least a foot from your face in order to avoid disrupting sleep . if you have a mobile device with a particularly strong backlight , like the ipad 3 , you should do both .
los angeles, california -lrb- cnn -rrb- -- christina aguilera signed a divorce petition that against husband jordan bratman los angeles county superior court thursday. the 29-year-old singer-actress cited `` irreconcilable differences '' the split from she five. aguilera 's petition said should dictate they separate. that agreement called jordan get none the money aguilera earned before, during their marriage. she is asking the judge grant joint legal and physical custody, max. `` although jordan and i separated, our commitment our son max remains as, '' aguilera released tuesday through her representative. -lrb- mashable -- apple 's production partners are already hard the new model ipad, according the wall street journal. the fact apple working an ipad 2, of, common knowledge. the famously tight-lipped company rarely talks upcoming product launches, is n't talking now. but apple has never denied intends follow up one. nearly $ 5 billion worth ipads the three quarters. and a quick glance the history, which launches a new model, suggests we the ipad 2 right the first anniversary its predecessor 's launch : april 3, 2011 aguilera costars with cher in `` burlesque, '' a major feature film set for a thanksgiving release. by. rachel reilly. many sleep experts blame using mobiles tablets into the early hours for a bad night 's sleep, gadgets may disrupt -- so long dim recent research led screen disrupts sleep because stops producing the hormone melanin, responds govern whether we feel a prototype the ipad 2 was apparently spotted a reuters reporter after the launch news corp 's ipad publication, the daily, last and an unconfirmed report digitimes in december said foxconn, the chinese makers ipad ordered manufacture 2 in market-ready quantities february. but the new study has simply lowering the brightness and holding the gadget about 12 stop interfering a good night 's sleep. smartphones other gadgets used before bed can cause restless nights because the light causes melatonin suppression - which controls. the journal report, which carries three bylines cites `` people familiar, '' offers detail. it confirms the ipad 2 will have, enabling use the facetime videoconferencing app. it says the 3g version again verizon at&t, with sprint still shut out. but contradicts earlier reports apple will endow the ipad 2 a higher-resolution screen, much had significantly higher resolution than apple is likely still working a higher quality ipad display -- just wo n't be ready the ipad 2. so will a slightly improved apple tablet with camera be enough persuade millions ipad users? are there other bells we do n't yet? we previously rumors the new device an sd card slot, -lrb- click our comprehensive roundup ipad 2 rumors. we 'll know apple 's acting ceo tim cook takes, if this product timeline, in a few months ' time. © 2010 mashable.com. all rights. ` in the old days, people bed read. but much commonly people go bed and they their tablet on which read they 're looking material. ` the problem it 's a lit device, how problematic the light source from the mobile device ' co dr lois krahn, a psychiatrist the mayo clinic scottsdale in arizona told medical daily. last month harvard academic and sleep expert professor charles czeisler called artificial light after journal nature. he said modern humans exposed four light 60 it disrupting our sleep patterns. he explained the decline hours slept affecting public health, including a greater risk depression in adults concentration problems previous studies found using a phone late prevents production the sleep hormone melanin. now experts holding the phone close could the problem. the new study investigated how levels light emitted mobile devices at a user 's face compared the threshold that suppresses the secretion, 30 lux. in a dark room, they used a sensitive light meter coming two apple tablets a smartphone : an ipad 1, 3 with retinal display the emitted light was measured 0 inches 14 inches from a user 's face. results. showed when the brightness the minimal setting,. led lights of all three devices were well below the 30 lux. melatonin-suppressing threshold. ` we found only at the highest setting was the light over a conservative threshold that might affect melatonin levels, ' said dr krahn. ` if it 's at the mid setting or it bright use. ' experts said some gadgets only need the backlight dimmed while such the ipad 3 require reduce light levels becoming. at the lowest brightness setting, held. right up against a user 's face, measured only. lux, the ipad 1 measured 11 lux and held 14 inches away a user 's face, all devices measured between 3 lux at. at the brightest setting measured from the same distance a user 's face, 4 measured 275 lux, the ipad 1 124 -- far above the melatonin-disrupting limit. when held 14 inches at the brightest setting, 4 measured 8 lux ipad 1 21 the ipad 3, however, measured 32 lux -- just above. the results suggest if must your smartphone before bed, either keep the screen brightness hold at least a foot in disrupting if a particularly strong backlight, like the ipad 3 do both.
because the light causes melatonin suppression - a chemical which controls the body clock . the journal report , which carries three bylines and cites `` people familiar with the matter , '' offers a few more nuggets of detail . it confirms the widely-held belief that the ipad 2 will have a front-facing camera , enabling use of the facetime videoconferencing app . it says that the 3g version will again be available on verizon and at&t , with sprint and t-mobile still shut out . but it contradicts earlier reports that apple will endow the ipad 2 with a higher-resolution screen , much as the iphone 4 had significantly higher resolution than the iphone 3gs . apple is likely still working on a higher quality ipad display -- it just wo n't be ready for the ipad 2 . so will a slightly improved apple tablet with camera be enough to persuade millions of ipad users to upgrade ? are there other bells and whistles we do n't know about yet ? we have previously reported on rumors that the new device will have an sd card slot , and that it will feature rear-facing and front-facing cameras . -lrb- click here for our comprehensive roundup of ipad 2 rumors -rrb- . we 'll know when apple 's acting ceo tim cook takes the stage , if this product timeline is accurate , in a few months ' time . © 2010 mashable.com . all rights reserved . ` in the old days , people would go to bed and read a book . but much more commonly people go to bed and they have their tablet on which they read a book or they read a newspaper or they 're looking at material . ` the problem is it 's a lit device , and how problematic is the light source from the mobile device ? ' co-author dr. lois krahn , a psychiatrist at the mayo clinic in scottsdale in arizona , told medical daily . last month harvard academic and sleep expert professor charles czeisler called for more research into the effects of artificial light after he published an article in journal nature . he said that modern humans are exposed to four times more light than 60 years ago and it was disrupting our sleep patterns . he explained that the decline in the number of hours slept per night is affecting public health , including a greater risk of obesity , diabetes , heart disease , depression and stroke in adults and concentration problems in children . previous studies found that using a phone late at night prevents production of the sleep hormone melanin . now experts say holding the phone close to your face could be the problem . the new study investigated how levels of light emitted from mobile devices at different distances from a user 's face compared to the threshold of light that suppresses the secretion of melatonin , 30 lux . in a dark room , they used a sensitive light meter to measure the light coming from two apple tablets and a smartphone : an ipad 1 , an ipad 3 with retinal display , and an iphone 4 . the emitted light was measured at 0 inches and 14 inches from a user 's face . results . showed that when the brightness was lowered to the minimal setting , the . led lights of all three devices were well below the 30 lux . melatonin-suppressing threshold . ` we found that only at the highest setting was the light over a conservative threshold that might affect melatonin levels , ' said dr. krahn . ` if it 's at the mid setting or at a low setting it 's bright enough to use . ' experts said some gadgets only need the backlight dimmed while other devices such as the ipad 3 require a two-pronged approach to reduce light levels becoming too high . at the lowest brightness setting , held . right up against a user 's face , the iphone 4 's backlight measured only 2 . lux , the ipad 1 measured 11 lux , and the ipad 3 measured 2 lux . held 14 inches away from a user 's face , all the devices measured between 0 and 3 lux at the lowest brightness setting . at the brightest setting measured from the same distance from a user 's face , the iphone 4 measured 275 lux , the ipad 1 measured 124 lux , and the ipad
 The article discusses how Apple's new iPad 2 will have a higher resolution screen, which may affect users' sleep patterns due to the suppression of melatonin production caused by exposure to bright lights. Experts suggest that using devices with bright screens before bedtime can disrupt sleep patterns and lead to health problems.