What each shade means
- Darkest: deep sleep
- Dark: REM sleep
- Light: light sleep
- Palest: awake
The dashed lines mark your average bedtime and wake time for the period on screen.
See one night in detail
Tap a night’s column to see that night in detail below the chart: a graph of your sleep stages from bedtime to wake, your overnight heart rate when your device shares it, and the time you spent in each stage. On iPhone, your latest night shows there until you tap another.
If a night shows a single shade
Some devices share only time asleep, not sleep stages, through Apple Health or Health Connect. Those nights show one shade and no stage graph. Check what your device shares before comparing nights across devices.