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"Comparing sleep stages can support improving sleep quality by helping to understand the distinct roles of REM and non-REM periods in physical repair and mental refreshment."
Comparing Sleep Stages

Comparing Sleep Stages

FeatureREMNON-REM
Brain ActivityHigh, active brainLow, slow waves
Eye MovementsRapid eye movementsMotionless eyes
Muscle ToneMuscles are paralyzedMuscles are relaxed but active
DreamingIntense dreamsDreaming is rare
DepthShallowDeep sleep
Body RepairBrain repair and memory consolidationPhysical repair and growth
Duration~30 minutes (followed by NON-REM)~90 minutes (followed by REM)