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It is incredibly creative in the connections it attempts beyond what our daytime thinking is capable of. REM also helps us make connections our brain wouldn’t even dare try during the day.REM sleep assists memory differently than deep sleep, focusing on social-emotional memories and even salvaging forgotten memories.It strengthens memories the night after you learn something new, like clicking “Save” for a new document. However, blood pressure, heart rate, and breathing quicken, and our eyes dart beneath our eyelids, thus named rapid-eye-movement sleep, regardless of whether we are dreaming.Dreams commonly occur during REM sleep, but muscles lose all tone, which prevents (most of) us from acting out our dreams.REM usually occurs later in a 90-minute sleep cycle and commonly just before waking.REM brain waves are shorter than delta waves and are not synchronized like deep wave sleep.It is called paradoxical sleep for this reason. REM Sleep is quite different from the other stages because the brain appears awake, but the body stays immobile.Source: bruniewska/Shutterstock REM Sleep Things that zap deep sleep include alcohol, benzodiazepines, opioid medications, lack of activity, and oversleeping ( sleeping past your regular wake-up time).The research is clear: we need deep wave sleep to be well. When we lack deep wave sleep, our risk for almost every disease goes up.Growth hormone production occurs in deep sleep and both decrease with age.(Thank goodness because it is difficult to wake from deep sleep, and if someone or something dares do this, you may feel disoriented and irritable). Deep sleep tends to disappear in the last cycles of the night when REM increases.The brain seems to prioritize it, dipping down into deep sleep about an hour after you nod off and then a few more times throughout the night. Deep sleep is more prevalent in the first half of the night.This “neural resonance” may help the lymphatic system cleanse our brains by flushing them of beta-amyloid plaques and misshapen proteins associated with Alzheimer’s disease.
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It is synchronized with other brain waves, unlike the disharmony of wave patterns during REM sleep. Deep sleep is generated from the frontal lobe and displays the brain at its most coordinated.Deep sleep occurs after shallow sleep (Stages 1 and 2) within a 90-minute sleep cycle.Slow delta brain waves oscillate at about two to four waves per second and make up less than 25 percent of our nightly slumber.I like to think of it as when our sleep sleeps. Deep sleep is one type, the deepest type of non-REM sleep.It goes by many names, including delta wave sleep (its predominant brain wave), Stage 3-4, Stage 3 or Stage 4 Sleep.