Naiman, leading you to experience shorter and shorter periods of REM sleep. “REM rebound is when REM sleep shows up earlier in the night and to a greater depth and intensity, even displacing deep sleep in the process.” -Rubin Naiman, PhD, psychologist and dream scientistīy contrast, once you start to experience some sleep deprivation-say, cutting back from your usual seven hours of sleep to five hours per night for a few nights in a row-the body starts to prioritize deep sleep (the last stage of non-REM) over REM, says Dr. “In this case, you’re rhythmically moving through all the stages of non-REM sleep, being dipped into more profound levels of serenity and deep sleep before the dreaming process really begins,” he says. On a night of average sleep, in which you’re not making up for any sleep deprivation, you’d typically get five minutes of REM at the end of the first 90-minute sleep cycle, 10 minutes at the end of the second, and so on, until you’re getting somewhere around 45 minutes at the very end of the night, which is when you’d experience most dreaming, says psychologist and dream scientist Rubin Naiman, PhD. To grasp how, exactly, REM rebound occurs and why it can deliver such vivid dreams, it’s helpful to know how REM typically shows up (when it's not rebounding).
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