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:
“The hippopotamus’s day
Is passed in sleep; at night he hunts;
God works in a mysterious way—
The Church can sleep and feed at once.”
—T.S. (Thomas Stearns)
“Let me have men about me that are fat,
Sleek-headed men and such as sleep a-nights.
Yon Cassius has a lean and hungry look.
He thinks too much. Such men are dangerous.”
—William Shakespeare (1564–1616)
“I’ll view the manners of the town,
Peruse the traders, gaze upon the buildings,
And then return and sleep within mine inn,
For with long travel I am stiff and weary.”
—William Shakespeare (1564–1616)