Battery life
When I go to sleep the battery charge is at like 60% and when I wake up it’s dead and this has happened twice now and I only got my iPhone 7 a couple of months ago!
Did you know you could safely put it on charge before you go to bed and leave it until the morning. It will not overcharge, the process will cut off when it is at 100% and then trickle charge as necessary.
If it is using power overnight that will be due to background apps that are running.