Its become a problem im modern society its mainly due to houses being warmer, with central heating it encourages the little blighters.
I belive the bugs live withing cracks and holes around the bed base.
I would throw the old bed out and get the pest controllers in before you, put the new bed in the effected room.
You can do it yourself but if you don't get them all it will be another bed.
Keep your bed well vacuumed and as aired as you can.