Sympathies.

In my case, spraying all over the room several times got them down to a tolerable level. By tolerable I mean that I was sleeping with no duvet or pillow so that they would have nowhere near me to hide, and often performing less-thorough sprays, and as far as I could tell, I wasn't getting bitten any more - so given several months, they would have just died off. I was still seeing one or two a week, though, and the spray probably wasn't too good for my health. That lasted maybe a month or so, then my landlord decided to just replace the bed, and I think I only saw one after that. (I've since moved out.)