from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The stage of sleep during which most brain activity and dreams occur, characterised by rapid eye movement (REM).
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a recurring sleep state during which dreaming occurs; a state of rapidly shifting eye movements during sleep
Sorry, no etymologies found.
American psychologists Nathaniel Kleitman and Eugene Aserinsky discovered the relationship between rapid eye movement REM sleep and dreaming, REM cycles, brain wave and respiratory patterns, and so forth.