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Sleep is a naturally recurring state characterized
by reduced or lacking consciousness, relatively
suspended sensory and non-motor activity - inactivity
of nearly all voluntary muscles. It is distinguished
from quiet wakefulness by a decreased ability to
react to stimuli, but it is more easily reversible
than hibernation or 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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