Changes

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'''Sleep''' is a naturally recurring [[state]] of [[relatively]] suspended sensory and motor [[activity]], characterized by total or partial [[unconsciousness]] and the inactivity of nearly all voluntary muscles.[1] It is distinguished from quiet [[wakefulness]] by a decreased ability to react to stimuli, and it is more easily reversible than [[hibernation]] or [[coma]]. It is observed in all mammals, all birds, and many reptiles, amphibians, and fish. In humans, other mammals, and a substantial majority of other animals that have been [[studied]] (such as some species of fish, birds, ants, and fruit flies), regular sleep is [[essential]] for survival.

'''Sleep''' is a naturally recurring [[state]] of [[relatively]] suspended sensory and motor [[activity]], characterized by total or partial [[unconsciousness]] and the inactivity of nearly all voluntary muscles.[1] It is distinguished from quiet [[wakefulness]] by a decreased ability to react to stimuli, and it is more easily reversible than [[hibernation]] or [[coma]]. It is observed in all mammals, all birds, and many reptiles, amphibians, and fish. In humans, other mammals, and a substantial majority of other animals that have been [[studied]] (such as some species of fish, birds, ants, and fruit flies), regular sleep is [[essential]] for survival.