My issue is that I wear it overnight and through the day. And what happens is that around an hour before bedtime, the battery gets to 20-30% but since I'm not constantly checking, I forget about that and don't take it off my wrist to charge it.

The only low battery notification I get is at like 10%. It'd be handy (heh) at least if we could get better notification reminders that align with our schedules to know when exactly to charge the watch so there's enough power for a night of sleep.