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:
“Life itself is a bubble and a skepticism, and a sleep within sleep.”
—Ralph Waldo Emerson (1803–1882)
“But a dog teaches a boy fidelity, perseverance, and to turn around three times before lying down—very important traits in times like these. In fact, just as soon as a dog comes along who, in addition to these qualities, also knows when to buy and sell stocks, he can be moved right up to the boy’s bedroom and the boy can sleep in the dog house.”
—Robert Benchley (1889–1945)
““You might just as well say,” added the Dormouse, which seemed to be talking in its sleep, “that ‘I breath when I sleep’ is the same thing as ‘I sleep when I breathe’!””
—Lewis Carroll [Charles Lutwidge Dodgson] (1832–1898)