Hi @rjjacobsen, I have similar symptoms but it's usually when my AHI number is above 4 which is my CPAP target number from my sleep medicine doctor. I have obstructive sleep apnea. Earlier this year I dumped my iWatch for a Fitbit Versa 4 (free from NIH All of Us Organization for sharing the health data). The sleep data is interesting but it doesn't give me the full details every night. I think it's mostly because it can't read my heart rate consistent sometimes if I forget to clean the back or move it higher on my arm to make it tighter. The last good reading I had was Friday night and I was awake 12% (1hr 6m), REM 18% (1hr 39m), Light 57% (5h 9m), Deep 13% (1h 9m) and my AHI was 3.1. Contrast that with Friday night Nov 3rd - AHI 8.3 well over my target of 4 and my Fitbit showed Awake 15% (1h 20m), REM no % shown - 1h 6m, Light 71% (6h 6m), Deep no % shown - 4m.

I'm wondering if the AHI is the key to feeling refreshed. Might be a good question to ask your sleep medicine doc. It's been about 4+ years since I had my sleep test and I don't remember seeing all of the detailed numbers from the sleep test.