Also, in REM sleep, your brain becomes highly active and functions at levels that are more similar to when you are awake. Breathing rate, heart rate, and blood pressure rise during this stage. REM sleep is sometimes referred to as paradoxical sleep because it has similarities to being awake. The American Sleep Association says that three things primarily occur during REM sleep: dreams, limited or no muscle movements (known as muscle atonia, and it happens, so we don’t act out our dreams), and rapid eye movements. It starts about 90 minutes after falling asleep. REM sleep is the sleep stage where most of our dreams happen. The NREM stages account for about 75% to 85% of your sleeping time, with the remaining 20% to 25% is spent in REM sleep. NREM-3 is more common during the 1st half of night, and REM is more common during the 2nd half of the night. We cycle through sleep stages multiple times as the night goes on, approximately in 90-minute timespans. Body temperature and heart rate are usually at their lowest, and the brain exhibits what are known as “slow waves” of activity which is why NREM-3 is sometimes referred to as “slow-wave sleep”.Įxperts agree that all the sleep stages are important for maintaining healthy sleep, each stage for different reasons. This is the deepest NREM sleep stage and it’s more difficult to wake someone up during this stage. Stage 3 NREM sleep: Also known as deep sleep, this stage is essential for brain and body recovery, growth, and immunity.Brain wave activity also slows down, body temperature goes down, and eye movements stop. Your heartbeat and breathing continue to slow down while your muscles relax.
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