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:
“It seems not more reasonable to leave the right of printing unrestrained, because writers may be afterwards censured, than it would be to sleep with doors unbolted, because by our laws we can hang a thief.”
—Samuel Johnson (1709–1784)
“Living is a sickness to which sleep provides relief every sixteen hours. It’s a palliative. The remedy is death.”
—Sébastien-Roch Nicolas De Chamfort (1741–1794)
“Only when one cannot sleep does one know how long the night is.”
—Chinese proverb.