Found our issue! We were pulling time in bed instead of time actually asleep. Also, we were not adjusted properly for the timing dynamics between days where a user falls asleep before midnight vs after, and what day that sleep gets logged to. Hence the 15 hours on 7/14 was combining two nights of sleep. 7/15 was 0 hours because that was counted on 7/14 because the user fell asleep ~11pm on 7/14.

The Past 3 days in our app showed the below: (7/16)- 7 hours (correct) (7/15) - 0 hours (incorrect, should be 8 hours) (7/14) - 15 hours (incorrect, should be 6 hours) Apple health code