I get National Pest Control Company to spray my house and surroundings twice a year. After the spraying all you have to do is sweep away the dead bodies. You'd be amazed. I also have them treat the manholes outside the house. You should've seen that sight. I actually got my camera and filmed. Hundreds, literally hundreds, of cockroaches were scampering away, climbing on walls, on the NPCC staff, everywhere.
Look at your home. There are cracks in the door frames where the frame meets the floor. The buggers love these places.
Get your home treated and you'll be sure to have peace of mind for a few months. Otherwise these unseen guests will make your home theirs. Believe me.