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Sleep data is super inaccurate

The last 3 nights my 955 has logged my sleep as being around 2-4 hours. I can assure you that's not the case. At times it just stops measuring in the middle of the night so it tallys that as 2-4 hrs of sleep. On other occurance it's unmeasurable for hours at a time in the middle of the night and then picks it back up at some point. 

This of course then messes up the rest of my data and suggestions. This was happening about a month ago but it seemed to get better but now its happening again and it's really frustrating.

My watch is securely on my wrist so there's little to no risk that the sensor just isn't against my wrist. I've also not been getting up in the middle of the night though I have seen that mess up my sleep tracking in the past. I also wear it all day, including the hours leading up to bed time. 

Are there any suggestions as to ensure it continues to measure throughout the night? Or is this just a bug.... 

I'd rather not override all my sleep data as well.