Did you know that simply sleeping and waking one hour earlier can cut the risk of depression? An earlier four-year study of 32,000 nurses who called themselves "early risers" had found that they were 27 percent less likely to develop depression symptoms. But newer research has homed in on how exactly shifting someone's sleep schedule can potentially affect them. Researchers collected data on over 800,000 people, including which hours of the day they were predisposed to prefer (also known as their chronotype). They determined that going to bed merely an hour earlier is associated with significantly lower risk of depression. So if someone who usually hits the sack at 11 p.m. instead goes to bed at midnight and sleeps for the same duration, they could lower their risk by 23 percent. The effect could potentially be almost twice that if shifted by two hours. The researchers aren't quite sure why they are getting these results, but it could have something to do with light a...