REM sleep is the last stage of a human’s sleep cycle, occuring after three NREM stages (also called deep sleep/slow-wave sleep). It’s characterised by rapid eye movement (hence the name), muscular paralysis and dreaming.
|Sleep Stages||Types of Sleep||Other Names||Normal Length|
|Stage 1||NREM||N1||1-5 minutes|
|Stage 2||NREM||N2||10-60 minutes|
|Stage 3||NREM||N3, Slow-Wave Sleep (SWS), Delta Sleep, Deep Sleep||20-40 minutes|
|Stage 4||REM||REM Sleep||10-60 minutes|
Missing REM sleep does not make you go crazy, apparently. But if you haven’t dropped into REM for a while, your body will eventually just skip non-REM sleep and go straight to the real deal to even out the deprivation.