[Baeocystin]

Interesting. I never knew there was a name for this phenomena. It happened to me every now and then as a kid, too, usually when I was sick and in bed. In my case, it made me feel vertigo, like size scales were shifting around so fast I'd lose my balance and fall over, stuff like that, but I don't remember any particular fear reaction per se, other than feeling kind of gross when it happened. I found that dim light (like a nightlight in a child's bedroom, with long shadows) was the worst trigger, and either bright light or complete darkness helped avoid it.