Sleep
Sleep is a naturally recurring state characterized by reduced or absent consciousness, relatively suspended sensory activity, and inactivity of nearly all voluntary muscles. It is distinguished from quiet wakefulness by a decreased ability to react to stimuli, and is more easily reversible than being in hibernation or a coma. Sleep is a heightened anabolic state, accentuating the growth and rejuvenation of the immune, nervous, skeletal and muscular systems. It is observed in all mammals, all birds, and many reptiles, amphibians, and fish.
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Famous quotes containing the word sleep:
“Freedom is the moment between sleep and waking before selfhood and the world return.”
—Mason Cooley (b. 1927)
“To sleep around is absolutely wrong for a woman; it’s degrading and it completely ruins her personality. Sooner or later it will destroy all that is feminine and beautiful and idealistic in her.”
—Barbara Cartland (b. 1901)