Why not since you're even using the watch? My main reason is to stop battery drain, I charged to 100% turn off before bed, wake up and you still have 100%. I also do it to give the battery some breaks.
Erm... not sure where you got the idea from of giving a “break” to inanimate objects. And rather than charging the device to 100% and turning it off, you can just leave it on charge. ¯\_(ツ)_/¯ just saying.