Be sure to closely inspect for bedbugs even NEW mattresses and bedframes that are brought into your home.
A few years ago I replaced my old bedding just because it was worn out, not because I had bedbugs... Little did I know that the brand new bed and frame came with a case of bedbugs. The truck they use to deliver the new with is the same truck they take away old bedding with. And apparently someone's old mattress was infested and got ono the new stuff.
I discovered them before they could get bad but yeah what a creepy dirty feeling you are left with. I also believe they are vectors for other parasites that have been vexing everyone... There really ~was~ a monster under the bed!