I am considering getting an Apple Watch, and sleep tracking would be one use case which could convince me to go for it as I sometimes have sleep disorder and would like to have some data on how long I sleep and how often I wake-up. Since Apple are not providing this natively, are some people here using third party apps and are you happy with them? In particular I am wondering: - Is the data captured accurate? (i.e. does the app accurately and automatically detect if you wake-up in the middle of the night and fall asleep again?) - does it have a significant impact on battery life? - Do you feel the watch is uncomfortable to wear while sleeping? - Is the data fully flowing through HealthKit? (so that if apple start supporting this native in the future historical data will already be available alongside with data captured by Apple) - Is there a good way to visualise the data one the phone? (the Apple Health app seems quite basic to view data) Thanks a lot!