Thanks for your replies. I'll try an airwrap - where can you get them from? I've been looking for sleeping bags for DS, but cannot seem to find any .

Those will help with his legs getting caught, but I think a lot of the problem is that he always ends up sleeping across the cot instead of up and down, and he's just too long to fit - so he always bumps his head.

If the airwrap doesn't help, I may end up trying his portacot - thanks for the suggestion Widdly.