Rapideyemovementsleep(REMsleepor REMS) is a unique phase ofsleepin mammals (including humans) and birds, characterized by random rapidmovementof theeyes, accompanied by low muscle tone throughout the body, and the propensity of thesleeperto dream vividly.
Did you know you go on a journey every night after you close youreyes?Sleepscientist Matt Walker breaks down the difference between REM (Rapid-EyeMovemen...
There are four phases ofsleep, including one for rapideyemovement(REM)sleepand three that form non-REM (NREM)sleep. These stages are determined based on an analysis of brain activity duringsleep, which shows distinct patterns that characterize each stage.

REM — or 'rapideyemovement' —sleepis one of the severalsleepcycles the body goes through each night. It begins about 90 minutes after falling asleep, and repeats. Longer periods of REMsleepoccur with each successive cycle.
Each phase and stage ofsleepincludes variations in muscle tone, brain wave patterns, andeyemovements. The body cycles through all stages approximately 4 to 6 times each night, averaging 90 minutes for each cycle.

Rapideyemovement(REM) duringsleepis normal and linked to memory encoding, but experiencing similareyemovementsor sensations, such as flickeringeyelidsor visual flashes, while trying to fall asleep is abnormal.
We focused our analysis on factors contributing tosleepfragilityduring non-rapid-eye-movement(NREM)sleep(stages N2 and N3, accounting for the majority ofsleep[7]), as several difficulties arise when considering alpha activity during rapid-eye-movement(REM)sleep(see...