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:
“So if hunger provokes wailing and wailing brings the breast; if the breast permits sucking and milk suggests its swallow; if swallowing issues in sleep and stomachy comfort, then need, ache, message, object, act, and satisfaction are soon associated like charms on a chain; shortly our wants begin to envision the things which well reduce them, and the organism is finally said to wish.”
—William Gass (b. 1924)
“Be not afeard; the isle is full of noises,
Sounds and sweet airs, that give delight, and hurt not.
Sometimes a thousand twangling instruments
Will hum about mine ears; and sometime voices,
That, if I then had waked after long sleep,
Will make me sleep again.”
—William Shakespeare (1564–1616)
“My one and noble heart has witnesses
In all love’s countries, that will watch awake;
And when blind sleep falls on the spying senses,
The heart is sensual, though five eyes break.”
—Dylan Thomas (1914–1953)