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In his book Healthy Sleep Habits, Happy Child, Marc Weissbluth, MD, provides these insightful comments on the functions of sleep:

"Sleep is the power source that keeps your mind alert and calm. Every night and at every nap, sleep recharges the brain's battery. Sleeping well increases brainpower just as weight lifting builds stronger muscles, because sleeping well increases your attention span and allows you to be physically relaxed and mentally alert at the same time. Then you are at your personal best."