Sorry BUGS, your brain isn't equipped for REM sleep, or any sleep for that matter.
How did some animals manage to survive the extinction?
It would only take a single oversized meal to kill or cause brain injury to a squid.
For penguins, laying eggs can be one dangerous job. Learn more on this Moment of Science.
Almost all mammals, in fact, have REM sleep; birds do too, although only in the early parts of their lives. It seems that sleep and REM are required by a particularly complex kind of brain.