Where Does Sleep Cycle Store Sleep Data?
Sleep Cycle sessions in account cloud and HealthKit with audio settings local.
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Sleep Cycle stores sleep sessions against the online account with HealthKit export alongside, while microphone sensitivity, alarm windows, sounds and snooze habits stay in app private storage per device. The graphs sync; the alarm setup does not always follow.
Years of history make the account worth protecting with a real login rather than an anonymous install. Phone upgrades restore sessions on sign in, then need microphone permission again and a quiet calibration night before smart wake feels right.
Where Sleep Cycle stores this, by platform
App-private storage (settings) plus account cloud (sleep history)
Sign in to preserve multi year history across phones. Alarm and microphone tuning redo per device. Health Connect export shares sessions with the wider Android health ecosystem.
App sandbox (settings) plus account cloud and HealthKit (history)
Same account bound history on iPhone with Apple Watch motion assist where supported. Premium statistics need the subscription; raw history remains visible regardless.
Frequently asked questions
how do I move Sleep Cycle history to a new phone
Sign into the same account on the new phone and let history sync down. Then grant microphone permission, redo alarm settings, and sleep one calibration night before trusting smart wake windows.
does Sleep Cycle write to Apple Health
Yes, sessions export to HealthKit when enabled, carrying sleep stages and quality. The export is one way for most fields, so the Sleep Cycle account remains the detailed archive.
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