You’re right. I haven’t thought about it.
There is a Mystic’s post about the relation between brain waves and prelucidity there:
[url]The Alpha-Lucidity Hypothesis]
But it’s an objective (physiological) point of view, and it doesn’t clarify the subjective (psychological) point of view about lucidity triggering.
On her blog (in French), Flo noticed that:
“Unexpected images are the dreamer’s worst enemy. When they take place when you fall asleep, they’re deadly. They’re also responsible for the loss of lucidity during FA’s and their underlying mechanism is responsible for the loss of lucidity during LD’s: that is to say that each new element which emerges in a dream leads to a reduction in clarity”.
But if it explains the loss of lucidity, it doesn’t explain why lucidity appears… or doesn’t!