Sleep is one of the great mysteries of life. Like gravity or the quantum field, we still donâ€™t understand exactly why we sleepâ€”although we are learning more about it every day. We do know, however, that good sleep is one of the cornerstones of health. Six to eight hours per night seems to be the optimal amount of sleep for most adults, and too much or too little can have adverse effects on your health. Sleep deprivation is such a chronic condition these days that you might not even realize you suffer from it. Science has now established that a sleep deficit can have serious, far reaching effects on your health.