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  1. Non-rapid eye movement sleep - Wikipedia

    • Non-rapid eye movement sleep (NREM), also known as quiescent sleep, is, collectively, sleep stages 1–3, previously known as stages 1–4. Rapid eye movement sleep (REM) is not included. There are distinct electroencephalographic and other characteristics seen in each stage. Unlike REM sleep, there is usually little or no eye move… See more

    Stages

    NREM sleep was divided into four stages in the Rechtschaffen and Kales (R&K) standardization of 1968. That has been … See more

    Sleep spindles and K-complexes

    Sleep spindles are unique to NREM sleep. The most spindle activity occurs at the beginning and the end of NREM. Sleep spindles involve activation in the brain in the areas of the thalamus, anterior cingulate a… See more

    Dreaming

    Although study participants' reports of intense dream vividness during REM sleep and increased recollection of dreams occurring during that phase suggest that dreaming most commonly occurs during that stage, … See more

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