Helle, there is a reason why my DH spends just about EVERY night on the couch!! I got so tired of him being a novelty for DD (neithers fault) that one night I just snapped and told him the reason she wasn't sleeping was because he was there and he needed to bugger off into one of the other bedrooms - he choose the couch!
We don't co-sleep. Jack never took to it, he prefers to sprawl out once he IS asleep. It's just getting him there that seems to be an issue at bed times. He's just too busy!