The Mind Monkey
Buddhism has this idea that the human mind is like a crazed monkey, hopping wildly and recklessly from one branch (or thought) to another. No focus, no real understanding. Just madness. I'm not Buddhist, but I think the metaphor is extremely apt for the non-lucid state of mind.

The mind monkey loves to leap from branch to fruitless branch. The more fretful and meaningless the thought, the better.
"You really ought to buy more stuff. Your life does not have nearly enough useless crap in it."
"You suck."
"Could you stop living as you please and be like all the other monkeys? You're supposed to be reading celebrity news about that one monkey w/ the colossal badonkadonk."
"Hey, I think that other monkey over there has more bananas than you. You should hate both yourself and that other monkey."
"You are not nearly popular enough. Please change yourself so that monkeys you don't care about will pretend to like you."
"There are monkeys out there who have a different worldview from you. This is unacceptable. Please engage in a pointless argument as soon as possible."
"You still suck."

When you're stressed and/or very busy, the mind monkey loves to take advantage of the chaos and run riot in your mind. But when you're meditating or living lucidly with a high level of awareness, the mind monkey just... shuts up. I don't know where he goes, but he's gone, and you're in complete command. (Ideally, one day he'll wander into a nearby woodchipper.)

And the mind monkey really helps sell the lie that the dream is reality!

WBTB Insomnia
Related to that, I've had insomnia after my WBTB two nights in a row. Night before last I took galantamine + choline and blamed it on that. But last night I experienced insomnia after WBTB as well, and I took absolutely no lucid aids. Admittedly, there's still some galantamine in my system during the WBTB. Galantamine's elimination half-life is 7 hours, so theoretically I still had about 0.5mg of G in my bloodstream. But this is an extremely small amount, and I think it had nothing to do with sleep trouble.

Essentially, I think the issue here is that the past couple of days I've rented my brain out almost exclusively as a problem-solving engine for cranking on work stuff, letting the LD/awareness/meditation side of things go pretty much dormant. Conditions are perfect for the mind monkey to carve out a nice little spot for himself.

But today's practice has been much better so far! Awareness work has been really good. Life's still busy and the brain's still busy, but there's just no need for awareness to slip. After all, when awareness falters, the mind monkey just takes up all the slack for himself anyway.