Step 1 : Introduction to the question "How many hours per day, on average, do elephants sleep?"
... Sleep in non-human animals refers to a behavioral and physiological state characterized by altered consciousness, reduced responsiveness to external stimuli, and homeostatic regulation. Sleep is observed in mammals, birds, reptiles, amphibians, and some fish, and, in some form, in insects and even in simpler animals such as nematodes. The internal circadian clock promotes sleep daily at night in diurnal organisms (such as humans) and in the day in nocturnal organisms (such as rodents). However, sleep patterns vary widely among species. Sleep appears to be a requirement for all mammals and most other animals.
Step 2 : Answer to the question "How many hours per day, on average, do elephants sleep?"
Two hours:
Wild elephants sleep an average of only two hours a night, making them one of the lightest sleepers among mammals. It isn't possible to record the electrical brain activity of an elephant because of the thickness of their skulls. To study elephant sleep habits, researchers attached motion sensors to the elephants' trunks. As one of the most active part of the elephant's body, the trunk is usually idle only while the animal is sleeping. Source: NewScientist.com
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