Format guide
Apple Health Sleep
Apple Health sleep stages
Sleep stage records from Apple Watch (when worn overnight), Asleep, Awake, Core, Deep, REM stages, plus In Bed periods. The Watch's sleep tracking became reliable in watchOS 9 (2022); older watchOS sleep data is just in/out of bed without stages.
How to open a Apple Health Sleep file
iOS Health app's Sleep section. For analysis, extract sleep records from export.zip into CSV.
Primary use
Sleep quality analysis; correlating sleep with workouts/HRV.
Convert Apple Health Sleep to other formats
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