I've suspected this is happening for some time (doctor never paid much attention to my claims) but now that I've downloaded sleepyhead, I'm seeing the proof. I will have clusters of events (most hypopnea, a few clear airway, several "respiratory effort causing arousal") early in the night, then go for long stretches of sleep with nothing. Sometimes if I wake in the night, a cluster will happen again as I'm going back to sleep. Over the course of the entire night, my average AHI is low enough that it wouldn't raise any red flags; but if you just look at the early stretches of time where I"m trying to fall asleep (and being woken frequently by the events) my AHI is definitely above five during those stretches.
I can post a screen shot of my sleepyhead results for a particularly rough night; however, I'm not exactly sure how to do that. When I try to insert an image, it asks for a URL. Is there a way to directly upload an image into a post?