All was not idyllic. I got up to pat his back a couple of times when he cried in his sleep. At one point (maybe around 5 a.m.?), I thought for sure he was going to crawl out of bed and join me. I crawled in with him for about ten minutes to warm him up, got a blanket on him, and went back to the queen. And that was basically that until 9 a.m.
He seems to really _like_ his bed, whether that's because it's new, it's smaller, it's his, it has Backyardigans sheets on it or when he's crammed in there with one of his parents it's really, really cozy. I'm sure there will be ongoing bed hopping in the days/weeks/months/years to come, but this is looking pretty promising.
This is the star turtle:
It was bought for T. by his uncle J., R.'s younger brother. While rather stunningly not the kind of thing we would ever buy, it is really, really cool.