The normal amount of REM sleep also declines with age, beginning with infancy (when it may be greater than 50% of total sleep time) and extending all the way through adulthood. If you get 7-8 hours of sleep, around 90 minutes of that should be REM. The final one may last roughly an hour.įor healthy adults, spending 20-25% of your time asleep in the REM stage is a good goal. On average you’ll go through 3-5 REM cycles per night, with each episode getting longer as the night progresses. You first enter REM sleep each usually within 90 minutes of falling asleep, and this period of REM only lasts about 10 minutes. For these reasons, REM sleep is sometimes called paradoxical sleep. As a precautionary measure, part of the brain also sends signals to immobilize your arms and legs in order to prevent you from acting out your dreams ( REM sleep behavior disorder). Your brain is almost as active in rapid eye movement sleep as when it’s awake, which is why most dreaming happens during this time. Brain consumes more oxygen and its activity increases significantlyīelow is a chart representing brain waves measured by an EEG when a person is awake, in REM sleep, and in non-REM sleep:.Respiratory rate speeds up and becomes erratic.Heart rate and blood pressure rise to levels nearly as high as when you’re awake.Eyes move rapidly back and forth behind closed eyelids.The following physiological changes occur during the REM stage of sleep: More generally speaking, there’s been research to suggest that when people are deprived of REM sleep they have trouble recollecting things they are taught before falling asleep. Beyond the obvious value this has for anyone, it’s significant to athletes from the perspective of technical skills worked on or practiced that day-they are retained during REM sleep, so failing to get the proper amount at night can prevent you from seeing the benefits of your practice that day. REM sleep is the time when new learnings from the day are committed to long-term memory. It follows light sleep and precedes REM sleep in a normal sleep cycle, and unlike REM when your heart and respiratory rate speed up, during deep sleep they both slow down. Deep sleep is the “physically restorative” stage when muscles repair themselves and cells regenerate. Something many people don't realize is that REM sleep and deep sleep (also referred to as slow wave sleep) are very different stages of sleep. Your brain is very active during REM sleep and it is when the most vivid dreams occur. It is known as the “mentally restorative” stage of sleep when the brain converts short-term memories into long-term ones. REM sleep, which means “rapid eye movement sleep,” is one of the 4 stages of sleep (along with light, deep and wake) that your body’s sleep cycles consist of.
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