--- title: "Sleep dates and daily notes" description: "Learn why overnight sleep belongs to its start date and which range to export in the morning." --- Health.md assigns a sleep session to the date on which it **started**. Sleep from Monday at 11:45 PM to Tuesday at 7:30 AM belongs to Monday's summary. Apple and Android share this rule even when Health Connect displays the wake date. | Goal | Export | |---|---| | Last night's sleep on Tuesday morning | **Yesterday** (Monday) | | Tuesday's activity | **Today** | | Both | Monday and Tuesday | Readable summaries keep the night together. Canonical source records retain their original start and end and belong to the start day; Health.md does not invent two halves. Use `healthmd_sleep_sessions` when software needs session semantics. Daily Note Injection and API Endpoint use the same attribution. If the source synchronizes late, export the start day again. Health.md does not currently offer a setting that moves summaries to the wake date.