We had a 2 bedroom suite on the Jade which is a Sister ship to the Jewel. The second bedroom has a pull down bed from the ceiling and a small bed on the floor in the very small second bedroom. I thought the couch was a sofa bed but can't remember. I highly doubt that the staff would remove the sofa and put in a bed, but you can certainly ask. You can however ask your Butler to leave the bed open and put a topper on it. I think you can ask for a roll away bed too. This is a lovely suite. The second bathroom was VERY nice, as the main bathroom is very open and the glass toilet door leave little to the imagination.
I can't remember how many people are allowed for this cabin.