There was a mouse in my loft once. He used to scratch the space just above my cupboard every night at about 2am and without fail, the damn thing would wake me up! So my dad made this really cool trap that was like a cage that mice can climb in to but not out of. We put a piece of cheese in there and checked it every day. Unfortunately the mouse didn't fall for the trap until about a month later when we had given up checking. Poor little dead mousie...