Researchers from Harvard, MIT, and the University of Colorado have observed that people who wake up earlier tend to be less depressed.
Though the study has only been among European descendants, the study shows that going to sleep early and waking up an hour or two early lowers the risk of depression by 23-40% respectively.
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Around 30 to 50 percent of people sleep between the hours of 11 pm and 7 am. Another 40 percents are either slightly morning people or slightly evening people.
To understand why some people are early birds while others are night owls, we have to take into consideration the body's circadian system.
About 1 in 2 people have relatively “normal” sleeping habits; they function most optimally when they don’t stay up too late or wake up too early and stick to a consistent sleep schedule.
Sleep needs vary from person to person. Age, genetics, lifestyle, and environment all play a role.
According to the National Sleep Foundation, adults need 7-9 hours of sleep a night. People who sleep seven hours a night are healthier and live longer. While the guideline is helpful, you are the best person to judge how much sleep you need.
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