<< Lizards might snooze like humans do. Sleeping lizards appear to share distinctive brain activity patterns with sleeping birds and mammals (..) If true, the results suggest that human sleep patterns evolved by around 300 million years ago in a common ancestor of birds, mammals and reptiles. >>
Sarah Schwartz. Dragons sleep like mammals and birds. Proof of reptiles’ slow-wave and REM cycle could alter understanding of slumber’s evolution. 2:19pm, April 28, 2016
https://www.sciencenews.org/article/dragons-sleep-mammals-and-birds
<< Sleep has been described in animals ranging from worms to humans. Yet the electrophysiological characteristics of brain sleep, such as slow-wave (SW) and rapid eye movement (REM) activities, are thought to be restricted to mammals and birds. Recording from the brain of a lizard, the Australian dragon Pogona vitticeps, we identified SW and REM sleep patterns, thus pushing back the probable evolution of these dynamics at least to the emergence of amniotes. The SW and REM sleep patterns that we observed in lizards oscillated continuously for 6 to 10 hours with a period of ~80 seconds. >>
Mark Shein-Idelson , Janie M. Ondracek, et al. Slow waves, sharp waves, ripples, and REM in sleeping dragons. Science 29 Apr 2016: Vol. 352, Issue 6285, pp. 590-595 DOI: 10.1126/science.aaf3621
http://science.sciencemag.org/content/352/6285/590