Hi, @Trina54! There are still some growing pains with the sleep stages. Also, if the heart rate was not continuous for some reason during the night (e.g., you slept on your wrist oddly and it messed with the contact), sometimes you might not get the detailed sleep stages. I would just write it off as a bad night and hopefully it will be back tomorrow!
MakMak | Community Council
If you find a response useful, please mark it as a solution to help others.
Check out the Lifestyle Forums for ways to get more active!