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:
“I think that it would be less difficult to live eternally than to be deprived of sleep throughout life.”
—Anton Pavlovich Chekhov (1860–1904)
“Your hair may be brushed, but your mind’s untidy,
You’ve had about seven hours’ sleep since Friday,
No wonder you feel that lost sensation;
You’re sunk from a riot of relaxation.”
—Ogden Nash (1902–1971)
“Six, or at most seven, hours’ sleep is, for a constancy, as much as you or anybody can want: more is only laziness and dozing, and is, I am persuaded, both unwholesome and stupefying.”
—Philip Dormer Stanhope, 4th Earl Chesterfield (1694–1773)