I recently upgraded to to the Samsung watch 6, the sleep function fails to record sleep often. For example I went to bed about 10.45pm and put the watch on sleep mode so didn't activate apps while sleeping. Woke this morning around 9.35am, I did wake twice during the night but very briefly, the my watch and Samsung heth is only saying I slept 1 hour 15.min.The watch is securely fastened in the right place and in the same wrist I gave used for years . The isn't the first time it's happened. It's now messing up my sleeping stats. Anyone else have this issue? Did you fix it?