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– Sleep stages include non-rapid eye movement (NREM) sleep stages 1 through 4 and rapid eye movement (REM) sleep.
– Characteristics vary across stages, from light sleep (NREM-1) to deep sleep (NREM-3/4) characterized by slow brain waves, and REM sleep associated with rapid eye movements, dreaming, and increased brain activity.
There are four sleep stages, including one for rapid eye movement (REM) sleep and three that form non-REM (NREM) sleep. These stages are determined based on an analysis of brain activity during sleep, which shows distinct patterns that characterize each stage.The breakdown of a person’s sleep into various cycles and stages is commonly referred to as sleep architecture. If someone undergoes a sleep study, their sleep architecture can be represented visually in a hypnogram, or graph.