High Quality Content by WIKIPEDIA articles! Sleep in non-human animals refers to how the behavioral and physiological state of sleep, mainly characterized by reversible unconsciousness, non-responsiveness to external stimuli, and motor passivity, appears in different categories of animals. A sleeping cat. The upright ears and the body position suggest the cat is experiencing NREM sleep. In REM sleep, the ears would have been tucked in and the skeletal muscles would have been relaxed due to the functional paralysis signifying REM sleep. Rats kept from sleeping die within a couple of weeks, but the exact function of sleep is still unknown. Sleep can follow a physiological or behavioral definition. In the physiological sense, sleep is a state characterized by a reversible unconsciousness, special brainwave patterns, sporadic eye movement, loss of muscle tone, and a compensatory increase following deprivation of the state. In the behavioral sense, sleep is characterized by non-responsiveness to external stimuli, the adoption of a typical posture, and the occupation of a sheltered site, all of which is usually repeated on a 24 hour basis.
Lambert M. Surhone
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