The 5 A.M. Revolution: Why High Achievers Wake Up Early and How You Can Do It, Too

by Dan Luca

Sleeping in complete darkness is important in getting a good night’s sleep because darkness increases the production of melatonin. Melatonin is a hormone produced by the pineal gland in the brain and controls the body’s sleep cycle. Melatonin is believed to cause a person to fall asleep faster and sleep better.