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Fullpower, February 13, 2019
Research shows that other mammals like humans have REM sleep stages and dreams. However, cold-blooded animals such as fish and lizards do not. REM is the sleep-stage when we dream and restore our cognition to wake- up more refreshed in the morning.
The data shows a correlation between resting heart-rate and REM sleep. What the data clearly shows is that females tend to get more REM sleep.