The Main Cause Of All Those Sleepless Nights

"Our bodies have 24-hour clocks, and these clocks time sleep," Dr. Earnest told The Huffington Post. "Two mechanisms control sleep: One is called a homeostat, which is like a fuel gage to tell how much sleep you need. The second mechanism is your circadian clock, which controls the timing of sleep. The problem is that over the years, we really haven't allowed our 24-hour clocks to control sleep properly because we’re imposing a lot of variability in our cycles."