Hi guys,
I always thought that during REM, you have totally relaxed muscles except eye movements.
Otherwise you could be diagnosed with REM sleep behaviour disorder ;-)
My Fenix 6 shows me sleep with REM , but sometimes there are quite a lot of 
movements recorded during REM and sometimes there aren't..
Sometimes it shows "light sleep" with no movements at all...
How about that? Any ideas or explanations?
I would be grateful.
Maybe you were snoring and someone was trying to shake you to make you stop 
The movement you're seeing on the chart isn't actually representing very significant movement. See the movement before and after sleep, and how much higher it is. Those little ripples of movement during sleep could be from very small movements - muscle twitching, heavy breathing, or your partner moving around next to you.
It shouldn't be any cause for concern unless there are peaks of movement that hit like the 2nd or 3rd line up on the chart and can't be explained by something like getting up to use the toilet.
It measured REM before breathing was introduced as a new metric. So I think it's largely just based on HR and movement.
I believe that HR typically increases during REM. But admittedly I don't really know a lot about it.
Increased heart rate (to near waking levels).
That should be a pretty good indicator of REM. My sleeping HR is typically about 10-20bpm lower than my awake resting HR. So if my HR increases to near waking levels, then I'm probably either in REM or I've gotten up to use the bathroom. Funny enough, a few times my watch has said I was in REM when in fact I know I was awake and using the bathroom
That's my heart rate during the night. Not many changes. My guess is it's neither the movement nor the heart rate but only the HRVariability left for detecting REM?
I haven't gotten up from my desk in hours, and right now I'm showing 65bpm, which is pretty typical for me. My sleeping HR is usually about 50. I seldom drop down to the 50's when I'm awake.
Perhaps I drink too much coffee
