Have you just updated to Watch OS 3.1.3 and sleep time has gone a bit pear shaped?
This is because Watch OS 3.1.3 has known bugs with motion and stand detection. Symptoms you will see on your Watch are:
Whom does this Affect?
Any AutoSleep customer that wears their watch whilst sleeping.
How to Solve in AutoSleep 2.0
You can work around this problem in AutoSleep 2.0 as follows:
Seeing on charge whilst not Charging?
If you see occasional gaps (single orange blocks), this can usually be solved by rebooting the Watch. To do this press the Crown & Side button until you see the Apple Logo. This usually prevents further occurrences of this problem.
AutoSleep 3.0 will be available this week, with an automatic detection for this problem, and many more improvements including German, French, Spanish, Italian, Dutch & Chinese language support.