If it helps any, Liebling has a similar bed. Cabin beds with things that swing out are the coolest, you are a rockin' mama for getting your child that. (Yes, I have my childhood wish fulfilment via my son.) He had a sleepover in it with a friend. Both boys are wigglers. Although Liebs ended up in the spare bed (at his request) to get some sleep, neither fell out. It is hard to get out of it without climbing over the rail, so to remember to do that means you have to remember there's a rail - and that usually promps that you're high up. I find it better than a normal single bed when I crawl in with Liebs some nights as he can't push me out of bed, I end up waking up on the side rail but not having fallen onto the floor.

I go with the others, have fun with the bed and in his room and ask where he wants to sleep.