Hello, thank you all for your advice. He does sleep in a grobag, bought in the hope that it would keep him in the cot longer, but he soon figured out how to unzip it himself. Wasn't keen on side rails as he'd most likely try to jump over them. So he has been bedding down on the floor and our new futon is coming tomorrow. Fingers crossed he will like it, we haven't had much sleep since Saturday...