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Sleep progresses through distinct stages, each characterized by specific brain wave patterns and physiological responses ranging from wakefulness to stages of non-rapid eye movement, known as non-REM, to rapid eye movement, referred to as REM. Understanding these stages helps in recognizing how sleep supports various bodily and cognitive functions.
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Quantifying Infra-slow Dynamics of Spectral Power and Heart Rate in Sleeping Mice
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Slow waves, sharp waves, ripples, and REM in sleeping dragons.

Mark Shein-Idelson1, Janie M Ondracek1, Hua-Peng Liaw1

  • 1Max Planck Institute for Brain Research, Frankfurt am Main, Germany.

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Summary

Scientists discovered slow-wave (SW) and rapid eye movement (REM) sleep patterns in lizards, suggesting these brain activities evolved earlier than previously thought, possibly before the emergence of amniotes.

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Area of Science:

  • Neuroscience
  • Evolutionary Biology
  • Comparative Physiology

Background:

  • Sleep, characterized by slow-wave (SW) and rapid eye movement (REM) activities, is well-documented in mammals and birds.
  • These electrophysiological sleep characteristics were previously believed to be exclusive to mammals and birds.

Purpose of the Study:

  • To investigate the presence and characteristics of SW and REM sleep in reptiles.
  • To determine the evolutionary origins of mammalian and avian sleep patterns.

Main Methods:

  • Electrophysiological recordings were conducted on the brains of the Australian dragon lizard (Pogona vitticeps).
  • Analysis focused on identifying oscillatory patterns indicative of SW and REM sleep.

Main Results:

  • SW and REM sleep patterns were identified in the lizard brain.
  • These sleep patterns exhibited continuous oscillation for 6 to 10 hours with a period of approximately 80 seconds.
  • Lizard SW dynamics, originating from the dorsal ventricular ridge, showed similarities to rodent hippocampal CA1, despite a lack of hodological similarity.

Conclusions:

  • The findings suggest that SW and REM sleep evolved at least to the emergence of amniotes.
  • The ancient oscillator circuit controlling SW-REM antagonism in amniotes may be conserved.
  • Reptiles exhibit complex sleep dynamics previously thought to be exclusive to mammals and birds, offering new insights into sleep evolution.