I tried Bill White's suggestion of addressing the ghosts-and-monsters issue by talking up St Michael. Hambet listened very attentively, and seemed to especially appreciate when I got to "St Michael and his big sword." He then eagerly interrupted to tell me that when St Michael is done with his sword, he puts it in a suitcase.
Well, he likes hearing about St Michael, but we are still having bedtime issues. Last night we settled the ghosts and monsters question and thought Hambet was asleep, when we heard that piteous noise again and were informed that there was a dinosaur in the bathroom. A lot of holding and reassuring, and almost a solid hour of hopping up and down before Hambet finally gave in and went to sleep.
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Yesterday Hambet held up his palm and told us, "I like my volcano stick!"