Will be thinking of you. It sounds unlikely that they WILL keep your DS in, but if they do, perhaps he might be quite sleepy from having had the aneasthetic? / painkillers? When we stayed in we were right up against the cot...which did have completely let-downable sides, so with a bit of arm-ache from you, you should be able to let him get to sleep while you cuddle him. But let's hope you will be tucked up at home as usual!
Hope it goes well.