The The Sleep Health Foundation study has shown that adults need 8 hours of sleep . According to the study , 30 percent of Australians say they lack sleep daily . Professor David Hillman said it 's important to pay back our sleep debts . He also says sleep can be broken up as long as you get the first 4 hours . Power naps should not be longer than 20 minutes or inertia will set in .
The Sleep Foundation study has shown that adults need 8 hours of sleep . According to the study , 30 percent of Australians say they lack sleep daily . Professor David Hillman said it 's important to pay back our sleep debts . He also says sleep can be broken up as long as you get the first 4 hours . Power naps should not be longer than 20 minutes or inertia will set in .