Clues to the functions of mammalian sleep

  title={Clues to the functions of mammalian sleep},
  author={Jerome M. Siegel},
  • J. Siegel
  • Published 26 October 2005
  • Biology, Psychology
  • Nature
The functions of mammalian sleep remain unclear. Most theories suggest a role for non-rapid eye movement (NREM) sleep in energy conservation and in nervous system recuperation. Theories of REM sleep have suggested a role for this state in periodic brain activation during sleep, in localized recuperative processes and in emotional regulation. Across mammals, the amount and nature of sleep are correlated with age, body size and ecological variables, such as whether the animals live in a… 
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