I updated to 1.0.13 yesterday just before bed.
When I started tracking, the watch got a bit warm after a while.
It also became very sluggish and the battery had drained 23% in an hour!
(If the stats are correct it drew 80% battery during my 7 hour sleep)
It seems that something got buggered
Just now when I tried to check for battery usage (through app settings on the phone), the app on the watch refused to let me go back to watch face and just popped back up again and again.
I had to force stop from the phone.