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:
“Still it cried, “Sleep no more!” to all the house:
“Glamis hath murdered sleep, and therefore Cawdor
Shall sleep no more, Macbeth shall sleep no more!””
—William Shakespeare (1564–1616)
“It seems not more reasonable to leave the right of printing unrestrained, because writers may be afterwards censured, than it would be to sleep with doors unbolted, because by our laws we can hang a thief.”
—Samuel Johnson (1709–1784)
“And such the trust that still were mine,
Though stormy winds swept o’er the brine,
Or though the tempest’s fiery breath
Roused me from sleep to wreck and death.
In ocean cave, still safe with Thee
The germ of immortality!
And calm and peaceful shall I sleep,
Rocked in the cradle of the deep.”
—Emma Hart Willard (1787–1870)