Categories used when analyzing sleep samples.
- iOS 8.0+
- watchOS 2.0+
Each sleep analysis sample can have only one value. To represent the user being both in bed and asleep, HealthKit uses two or more samples with overlapping times.
By comparing the start and end times of these samples, apps can calculate a number of secondary statistics: the amount of time it took for the user to fall asleep, the percentage of time in bed that the user actually spent sleeping, the number of times the user woke while in bed, and the total amount of time spent both in bed and asleep.