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:
“John Anderson my jo, John,
We clamb the hill the gither;
And mony a canty day, John,
We’ve had wi’ ane anither:
Now we maun totter down, John,
And hand in hand we’ll go;
And sleep the gither at the foot,
John Anderson my Jo.”
—Robert Burns (1759–1796)
“It no longer makes sense to speak of “feeding problems” or “sleep problems” or “negative behavior” is if they were distinct categories, but to speak of “problems of development” and to search for the meaning of feeding and sleep disturbances or behavior disorders in the developmental phase which has produced them.”
—Selma H. Fraiberg (20th century)
“Life itself is a bubble and a skepticism, and a sleep within sleep.”
—Ralph Waldo Emerson (1803–1882)