Waking around the same time without an alarm
Ever wondered why you wake up in the morning—even when the alarm clock isn't making jarring noises? Wonder no more. Researchers at the Salk Institute for Biological Studies have identified a new component of the biological clock, a gene responsible for starting the clock from its restful state every morning.


http://www.salk.edu/news/pressrelease_details.php?press_id=521