Nightlight in the bathroom. We also have a nightlight in the hallway. I had an outlet put in just for that reason.
Prior to that,we left the hall light on all night-reason being we have a black lab and she sleeps in the hall, sometimes outside my room, sometimes outside the kids' rooms, sometimes by the bathroom, never know where she'll be, and since she's all black, if there's no light on, you can't see her at all and there's tripping and falling and either the dog or a human is going to get hurt. LOL
Also leave an outside light by the garage on.