When it was first put together we put him in there so we could do some clean up. He was horsing around in there and acting like a regular clown. I was worried he'd fail to nap since it was new and exciting but he was a champ.
When he woke up from his nap he pointed to get put back in, then ran his hand across the mattress (as though to say 'this is sweet') then laid down flat on his face/belly and just smiled. I think he likes it.