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:
“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)
“I sit in the top of the wood, my eyes closed.
Inaction, no falsifying dream
Between my hooked head and hooked feet:
Or in sleep rehearse perfect kills and eat.”
—Ted Hughes (b. 1930)
“Dear, be the tree your sleep awaits;
Worms be your words, you not safe from ours.”
—John Ashbery (b. 1927)