M.M.
It's probably a mouse. If it is getting cooler where you are they are trying to move in and set up house before the cold comes.
In our summer home we use regular mousetraps and peanut butter.
You can place it right next to your fruit bowl, then in the am clean real well.
Be sure to put all your food away and take out the trash in case any of his friends have found the entrance to the new mansion.
Mice are annoying but probably won't bring in any terrible diseases
DO NOT use poison. The mouse will ingest it then go into the walls where his hiding place is. He will then die in there and that is a real pain in the tuckus to clean up if he starts to rot.