: How does the heart rate change during REM and non-REM stages? I read different references and I understand that the average heart rate during sleep decreases by some beats per minute. The heart rate is slower in non-REM stage

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How does the heart rate change during REM and non-REM stages?
I read different references and I understand that the average heart rate during sleep decreases by some beats per minute. The heart rate is slower in non-REM stage than REM but I found no measurements or ranges related to the heart rate variation during these two stages. If we consider a healthy group of people, does the heart rate during REM and non-REM change within a specific range? Is it possible to detect the REM stage by only tracking the heart rate (by wearable watches)?

Thank you!

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