Found 2 smallish ones (thank God) in my bathroom the past 2 weeks, it's a small brand new bathroom with no holes or gaps anywhere and no window.
Don't have a bath either.
The only place I could think of would be out of the small gap in the sink, so they must have crawled up the sink and then all the way down it onto the floor.
Anything I could put around it or anything I could use to block them coming out?