Last night I decided to leave Kirby's crate door open just to see what would happen. Sure enough, within 5 minutes Kirby was laying down next to the bed. Within 10 minutes there was a light scuffle and Baxter ended up laying down next to the bed and Kirby was smack in the middle of Baxter's bed. As I started to doze off, I heard a bark coming from the stairwell...Kirby was wandering around the house in the dark and, I expect, either barking at the neighbors coming home or maybe the coyote across the way.
Back to the crate, door closed. All slept well from then on. Guess he's not ready for that much freedom yet. I think perhaps he feels safer in his latched crate and when he's not in there, he feels compelled to patrol the territory.