i only know because we had them a few years ago , not in our bed though thats disgusting!
i think they used to breed under our fridge and along the gap between the carpet and the skirting boards!
they tend to be active at night and early in the morning so i used to go around with the hoover sucking them up and stabbing the ones that were in the gap where the carpet meets the skirting board.
the beetles can fly so check the tops of your curtain , in my house they used to be atracted to the yellow curtains in my pc room and every morning i would find 1-2 beetles on them.
check under your fridge and any furniture to see if they are breeding anywhere else , you should see the skins the grubs have sheded as they grow like snake skins.
in our house they seemed to breed under the fridge.
it took me about 3 years to totaly get rid mind! they seemed to come back every year but less and less , ant powder from wilkinsons works to kill them if you are very generous with it
i used to coat along the skirting boards with it as that was mainly where they would crawl at night
