Reading up on sleep.
Ocean going mammals such as dolphins and whales practice unihemispheric sleep. One side of their brain sleeps at a time, never both at once.
Seals sleep this way when they sleep in the water. On land, they sleep like we do.
Do reptiles sleep? There is debate. Most sites said reptiles do NOT have REM, but apparently, that is not necessarily true.
http://www.psychologytoday.com/blog/dream-catcher/201105/evolution-rem-sleep-and-dreams
http://www.improverse.com/ed-articles/richard_wilkerson_2003_jan_evolution.htm
Ocean going mammals such as dolphins and whales practice unihemispheric sleep. One side of their brain sleeps at a time, never both at once.
Seals sleep this way when they sleep in the water. On land, they sleep like we do.
Do reptiles sleep? There is debate. Most sites said reptiles do NOT have REM, but apparently, that is not necessarily true.
http://www.psychologytoday.com/blog/dream-catcher/201105/evolution-rem-sleep-and-dreams
http://www.improverse.com/ed-articles/richard_wilkerson_2003_jan_evolution.htm