Slow waves, sharp waves, ripples, and REM in sleeping dragons

@article{SheinIdelson2016SlowWS,
  title={Slow waves, sharp waves, ripples, and REM in sleeping dragons},
  author={Mark Shein-Idelson and Jan Ondracek and Hua-Peng Liaw and Sam Reiter and Gilles Laurent},
  journal={Science},
  year={2016},
  volume={352},
  pages={590 - 595}
}
The dragon sleeps tonight Most animal species sleep, from invertebrates to primates. However, neuroscientists have until now only actively recorded the sleeping brains of birds and mammals. Shein-Idelson et al. now describe the electrophysiological hallmarks of sleep in reptiles. Recordings from the brains of Australian dragons revealed the typical features of slow-wave sleep and rapid eye movement (REM) sleep. These findings indicate that the brainstem circuits responsible for slow-wave and… 
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References

SHOWING 1-10 OF 82 REFERENCES
Mammalian-like features of sleep structure in zebra finches
TLDR
It is hypothesize that shared, ancestral characteristics of sleep in amniotes evolved under selective pressures common to songbirds and mammals, resulting in convergent characteristics ofSleep.
Control of REM Sleep by Ventral Medulla GABAergic Neurons
TLDR
It is shown that a GABAergic (γ-aminobutyric-acid-releasing) pathway originating from the ventral medulla powerfully promotes REM sleep in mice and identifies a key component of the pontomedullary network controlling REM sleep.
Cells of a common developmental origin regulate REM/non-REM sleep and wakefulness in mice
TLDR
To functionally isolate from the complex mixture of neurons populating the brainstem pons those involved in switching between REM and NREM sleep, chemogenetically manipulated neurons of a specific embryonic cell lineage in mice.
Unearthing the Phylogenetic Roots of Sleep
A putative flip–flop switch for control of REM sleep
TLDR
A brainstem flip–flop switch is proposed, consisting of mutually inhibitory REM-off and REM-on areas in the mesopontine tegmentum that contain GABA (γ-aminobutyric acid)-ergic neurons that heavily innervate the other.
Evolution of wakefulness, sleep and hibernation: From reptiles to mammals
Control of sleep and wakefulness.
TLDR
Genetic studies suggest that brain mechanisms controlling waking and NREM sleep are strongly conserved throughout evolution, underscoring their enormous importance for brain function.
...
...