If it's in your house it's quite likely it's looking for Shelter or food, But yeah you should really be carefull about that. A female could be looking for a place to breed, a male could be gathering food for his offspring. Mice usually aren't a lonely bunch... you might not have a nest in your house, but you could have one nearby.
We had mice over here a while back. There was the vacant lot nearby that instead of mowing down the grass some jackass thought it would be a good idea to torch it. A small familty of rats moved in to our house. We were building an extra room on the back, so there was some construction materials lying around. Easy nest, and they came through the door for food during the night. Our next door neighboor got himself a 2 feet long snake...
Eventually we had to pretty much lock down the house for a week and poison the outside to get rid of them, there was just no other way. Once they find safety and food, they are staying.
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