Rapid Eye Movement sleep

Frae Wikipedia, the free beuk o knawledge
A saumple hypnogram (electroencephalogram o sleep) shawin sleep cycles chairacterised bi increasin paradoxical (REM) sleep.

Rapid Eye Movement sleep (REM sleep or REMS; Inglis: Fest Ee Muivement) is a unique phase o sleep in mammals an birds, distinguishable bi random/rapid muivement o the ees, accompanied wi law muscle tone ootthrou the bouk, an the propensity o the sleeper tae dream vievely.