Before the Industrial Revolution, when night arrived, the sky darkened. This was conducive to sleep, and our natural circadian rhythms. With the increased use of electricity and electric lights, we turn our nights into days and prevent sleep. Over two-third of Americans suffer from sleep problems. And medicine has now determined that lose of sleep can lead to depression, diabetes, obesity and cancer. More than half of all alcoholics have sleep issues, begs the question of which came first.