Mar 11, 2008

Do all animals sleep?

Trends in Neurosciences
Jerome Siegel

Abstract

Some animals never exhibit a state that meets the behavioral definition of sleep. Others suspend or greatly reduce 'sleep' behavior for many weeks during the postpartum period or during seasonal migrations without any consequent 'sleep debt.' Rats die from one form of sleep deprivation, but sleep loss has not been shown to cause death in well-controlled studies in other vertebrate species. Some marine mammal species do not show evidence for REM sleep, and convincing evidence for this state in reptiles, fish and insects is lacking. The enormous variation in the nature of rest and sleep states across the animal kingdom and within the mammalian class has important implications for understanding the evolution and functions of sleep.

  • References50
  • Citations81
  • References50
  • Citations81

Mentioned in this Paper

Vertebrates
Metabolic Process, Cellular
Insufficient Sleep Syndrome
Apis mellifera
Molecular Motor Activity
Entire Brainstem
Hypokinesia
Sleep, Slow-Wave
Neurons
Brain

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