Fairly new cat owner here. DCat has brought in a live, apparently unharmed mouse which was last seen heading towards the sofa. Despite looking everywhere last night I can’t see where the sodding thing went and DCat is happily curled up asleep as if it’s nothing to do with him! 
I have ordered one of those humane traps to catch it but is there anything else I should do? I’m a bit overly anxious about hygiene and things and slightly struggling with the thought of the mouse in our (open plan) living room- kitchen 