I've also been having this experience. First it was the fact that deep sleep cycles really started to get smaller. This started sometime in 2020. Now, (I'd say since about March) it's even harder to get any deep sleep recorded and if I do, it's a very short period of time. Also it seems that the time I'm asleep is starting to shift too - like it's recording my time as though I was in a different time zone than I am. It's extremely disappointing as this is a feature I use VERY heavily.
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