At the moment we have DD in her own room in a cot bed and we have a spare room which did have a king size spare bed in it but it was old and knackered and we had the chance recently to get rid of it so we did.
At some point in the future the spare bedroom will probably be either DD's room when she is a bit older or a room for a new baby.
So, what I want to do is buy a bed for that room for nights when I need to sleep in with DD (like last night shudder) or DH does but really I dont want to buy another double bed and then have to get rid of it in years to come as we need a toddler/ single bed. Does anyone have any solutions?
I could probably get a small double which would suit the room and the fact i might need to sleep in there with DD from time to time quite well but then what happens when that is her bed in the future? Would be a bit big for a toddler to go into. 
Not the biggest of problems but its doing my head in. ta :)