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Sleep is the state of natural rest observed in most
mammals, birds, fish, as well as invertebrates such
as the fruitfly Drosophila. It is characterized
by a reduction in voluntary body movement, decreased
reaction to external stimuli, an increased rate
of anabolism (the synthesis of cell structures),
and a decreased rate of catabolism (the breakdown
of cell structures). In humans, mammals and many
other animals which have been studied, such as fish,
birds, mice, ants and fruitflies, regular sleep
is necessary for survival... |
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