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:
“Against war one might say that it makes the victor stupid and the vanquished malicious. In its favor, that in producing these two effects it barbarizes, and so makes the combatants more natural. For culture it is a sleep or a wintertime, and man emerges from it stronger for good and for evil.”
—Friedrich Nietzsche (1844–1900)
“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)
“And the beauty
Of the moonlight
Falling there,
Falling
As sleep falls
In the innocent air.”
—Wallace Stevens (1879–1955)