I don’t believe for a second that Henry stays in that bedroom all night! There is no way.And I know dogs are smart, but I don’t think they understand the concept of ‘choosing a bedroom’! Any of the dogs I’ve looked after have always just moved between the rooms during the night, sleeping wherever they want with no regard for who is in there!
Edit - in fact, thinking on it, I’ve never known a dog to want to sleep alone. Unless crated, they’ve mostly always spent time in the rooms with people.