Sleep app has never been consistent. Large gaps of time with no data. I have tried every suggestion on YouTube and Google search.
I will add that my apple watch ultra that I gave my wife, the sleep app worked flawlessly from about 10 minutes after going to bed all night long until woke up, with no missing data or gaps. I hope that Samsung will make a fix a priority. I think this issue is is a common problem with Samsung watches, it's not a good thing when your competition far surpasses you.
Update 11/25/2025
Still have the same issue, looking for more ideas. Yesterday I completely reset my watch and last night everything was good from 11:20 PM to 3:20 AM then no data at all. I got up to use the bathroom at around 3:20 AM, so I am assuming the App thought I was finished sleeping? This has been very frustrating, but I will continue to pursue a fix. I still like my Samsung Ultra watch and I am confident that one day the sleep tracking will be 100%
Also my watch is on version UI 8.0
