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felix01 said:I use AutoSleep (which requires wearing the watch all night) and haven't had any problem keeping the watch charged. I've gotten into a routine of putting the Apple Watch on the nightstand charger when I get home from work and it's fully charged well before I retire for the night and put the watch back on. When I get up in the morning, I stick it on the bathroom charger (I have a second charger in the bathroom) while I'm showering and shaving and getting dressed. It's fully topped off again and ready for a day of use.
The one thing I will mention, if you're a light sleeper, is make yourself a custom face which is dark and shows nothing but the digital time in a large font size. That'll reduce your overnight battery draw. My nighttime face is black with red digital time to preserve night vision and no complications running. The AutoSleep app runs in the background and draws very little battery current. It literally takes about three seconds to change nighttime face back to one of the daytime faces I've set up.
Apple shouldn't have any problem tracking sleep patterns without excessive battery draw despite having to wear the device all night. I think they spec out the full charge time at 2 1/2 hours. I never go to 0% so it doesn't even take that long to charge.