The first thing you may want to consider is vacuuming the whole couch with a vacuum. You will then sprinkle diatomaceous earth and place glue boards to trap the bed bugs that come out at night. You can also spray them with rubbing alcohol as this gets rid of them on the spot. You can check out http://www.ehow.com/how_6785907_rid-bed-bugs-couch.html for more details.
a powder called Didomaceteuous Earth (sp?) but you spread it around the floor and in the couch where they live. Don't let them spread to your bed, don't wear the same clothes or use any pillows from the couch near your bed. Do it now, before they spread.