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Bears and many other animals like skunks, raccoons, and even birds do go into a deep sleep - torpor - but for much shorter amounts of time; only up to a few hours or a day at most. As they sleep ...
Sleep can follow a physiological or behavioral definition. 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, this last known ...
Crepuscular, a classification of animals that are active primarily during twilight, making them similar to nocturnal animals. Diurnality, plant or animal behavior characterized by activity during the day and sleeping at night. Cathemeral, a classification of organisms with sporadic and random intervals of activity during the day or night.
Northern bat hibernating in Norway Bats hibernating in a silver mine. Hibernation is a state of minimal activity and metabolic depression undergone by some animal species. . Hibernation is a seasonal heterothermy characterized by low body-temperature, slow breathing and heart-rate, and low metaboli
Crepuscular, a classification of animals that are active primarily during twilight, making them similar to nocturnal animals. Diurnality, plant or animal behavior characterized by activity during the day and sleeping at night. Cathemeral, a classification of organisms with sporadic and random intervals of activity during the day or night.
Torpor is a well-controlled thermoregulatory process and not, as previously thought, the result of switching off thermoregulation. [8] Marsupial torpor differs from non-marsupial mammalian ( eutherian ) torpor in the characteristics of arousal.
A big brown bat, sleeping on a cave wall Big brown bats enter into hibernation around November, often in a location less than 80 km (50 mi) away from their summer roosts. [ 45 ] Big brown bats often hibernate by themselves, [ 45 ] [ 46 ] [ 47 ] or in small groups.
One physiological characteristic of sleep goes by the name of "homeostatic regulation". This is the notion that animals need a more or less constant amount of sleep every day, so that if a subject is deprived of sleep one day, the amount of sleep tends to "rebound" (increase) the next few days. This has been observed in zebrafish. At night ...