| http://www.w3.org/ns/prov#value | - In the physiological sense, sleep is a state characterized by reversible unconsciousness, special brainwave patterns, sporadic eye movement, loss of muscle tone (possibly with some exceptions; see below regarding the sleep of birds and of aquatic mammals), and a compensatory increase following deprivation of the state.[2] In the behavioral sense, sleep is characterized by non-responsiveness to ext
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