we have a few in our house we live in at them moment, but loads in our new house, (old house renovated) it is far damper up there so that would explain how come.
They are horrible creatures and like yourself have been concerned about them being in the bedroom at night, worried where they might crawl if they are after bed bugs!!
They do not like the gold coloured raid we have found (watch one die, its horrible, I can't help feeling sorry for them!) so a good squirt of that 1 hour before bed should help keep the little b**ger at bay for a while anyway.