Duration is shorter, lenght is wrong - Sleep as Android

​The Sleep Duration is total sum of all your sleep phases (Light, REM, and Deep), not counting the awake phases - because when awake, you are actually not sleeping. ​So on default settings, the Sleep duration is always a bit shorter than the duration of tracking.

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