I updated my GW4 to the newest software update Wednesday night and it hasn't tracked any sleep since. I manually entered it for Wednesday night and just checked now to see if last night's sleep has been tracked but it hasn't 😏
I just reset the watch, strange thing is that I have tried to manually enter last nights sleep, as it still isnt shoeing on the watch or in the health app and it tells me that there is already a sleep entry for that time 🤔 hopefully it catches up later in the day haha
After reading you message I paid special attention last night, and found mine working better than before. That's after latest update.
Previously it always showed deep sleep as 5 mins at most which is not normal for people. last night tracked 45 mins which seem more inline with the Garmin I used to have. The garmin are known to be quite accurate
It has tracked my sleep fine since Friday night, but it is still not showing any sleep data for Thursday night. Maybe the reset helped, but yes I have noticed longer deep sleep periods too.