Mice will come into your house during the fall and winter Months especially as it’s nice and warm, plenty of places they can hide, and a crapload of edible stuff and water source… we had em a couple of years ago out of the blue and it was a real pain to get rid of them.. thanks to my supercat and glue traps, we managed to kill around 40 in total… I know glue traps, but seriously it’s the only thing that really works… poisons, humane traps just don’t do it… and mice in a house are regally dangerous because they chew wires, and carry so many bad bugs…