Bed bugs do not live in the mattress so much as around it. They sit in bed frame joints, slats and screw holes, behind the bedhead, in the skirting board gap and along the seams of a chair nobody ever moves. Bites in a line down one arm, small blood spots on the sheet and dark specks in the frame joints are the giveaways. Treatment covers the whole room rather than just the bed, and it takes two passes, because nothing on the market kills the eggs.
The second visit at around the two-week mark is what finishes it, timed for the eggs that have hatched since. In between, you keep sleeping in that bed. Moving to the couch just moves the infestation to the couch. Bagging and hot-washing bedding at 60 degrees, then running the dryer hot, does more than most people expect. For rentals and short-stay places around Geelong we work room by room and check the rooms either side, because they travel through wall cavities and along skirtings.
