I do have the battery % in the top left corner of my face.
I do not use sleep tracking, charge the watch overnight.
And I will say, for me displaying the % has. become not useful. For the first year or so I could go through 2 days before charging and towards the end of the 2nd day it was helpful to know where the % is, but, since I think around watchOS 7 I have put my watch on the charger overnight and I always end up around 50% +/-5 or so at the end of the day. Havn't seen the low percentage alert in at least a year if not longer.