Duration is shorter, length is wrong - Sleep as Android

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.

This is a companion discussion topic for the original entry at https://sleep.urbandroid.org/docs/faqs/duration_shorter.html