ఏనుగు నిద్ర , Elephant Sleep

Sleep is very important to every living creature . Elephant sleeps about Two hours per day .

About Sleep :

The amount and nature of sleep is correlated with age, body size and ecological variables, including life in the terrestrial vs. aquatic environment, diet and the safety of the sleeping site. The sleep phylogeny literature suggests that sleep reduces activity to the amount needed for feeding and species reproduction, and maximizes energy conservation, thereby furthering genetic survival. Theories of REM sleep function have suggested that in addition to these functions, this state may have a role in periodic brain activation during sleep, in localized brain and body recuperative processes and in emotional regulation.

Daily sleep amounts vary substantially throughout the mammalian class. Some animals, such as bats and opossums, sleep for 18-20 h/day (Fig. 1), whereas others, such as the elephant and giraffe, sleep as little as 3-4 h/day. One might expect that species in each mammalian order would have a similar pattern of sleep because of their defining genetic, behavioral, and anatomical similarities. However, this is not the case. Primates as a group or carnivores as a group or rodents as a group do not have a characteristic sleep duration. Sleep time in these various orders overlaps extensively and any “order related” contribution to sleep duration must be small relative to other factors (Zepelin et al., 2005). Human sleep does not appear to be quantitatively unique in its duration or in the proportion or absolute amount of REM sleep.

Daily sleep amounts are highest in carnivores, lower in omnivores and lowest in herbivores. Sleep time is inversely correlated with body mass in herbivores. This correlation is responsible for a significant overall correlation between body mass and sleep time over all mammals studied to date (Zepelin et al., 2005)

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