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[About sleep in the elderly] As explained in the video, non-REM sleep becomes shallower and REM sleep decreases in the elderly. So what increases? It's shallow non-REM sleep. It's probably similar to the image of sleep becoming less sharp. The difference between REM sleep and non-REM sleep is hard to remember, but if you make connections, it fits in your head surprisingly easily ???? Also, the points for the national exam are almost fixed, so once you memorize them, it will become a source of points. 0:00~Introduction 1:27~The meaning and types of sleep 1:55~Effects of sleep 2:52~The difference between REM sleep and non-REM sleep 2:59~What is REM sleep 4:46~National exam questions about REM sleep 5:37~What is non-REM sleep 6:58~Sleep that changes over time 8:44~Changes due to aging 9:48~Summary Produced by: Medic Media Igawahara Ryo Production cooperation: Yokosuka Ryosuke, Internal Medicine, St. Luke's International Hospital Illustrations: Aida Y, Massaman curry