Why my instinct 2 Didint end sleep automatically, I always have to do it manually, anyway it still shows over 20h of sleep, I just have to press edit dont change anything and save, after that sleep time is proper
How are your sleep hours set? Did not you accidentally inverse the Bed and Wake-up times, or made them way too wide? In case adjusting the sleep hours does not help, in your place I would remove the watch from Connect, reset it to factory defaults with deleting all data, and then add it back, setting the sleep hours again, with the Bed time preferably before the midnight.
