Duration is shorter, length is wrong
Sleep duration is the sum of all your sleep stages (light, REM, and deep), not including waking stages - because you are not really sleeping when you are awake.
So on default settings, your Sleep Duration ,ay be a little shorter than your tracking time.
If you want your sleep duration to be the same as your tracking duration:
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Disable the awake detection in Settings → Sleep tracking → Awake detection.
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You can also try to adjust the sensitivity of each type of settings to get optimal results. In most cases, too many awake periods are caused by significant HR peaks.
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If you are not sure, where these awake periods are coming from, please use the Left ☰ menu → Support → Report a bug, and send us the application log.
Tags: tracking, actigraphy, graph