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