Oh? Is that the only thing you could cherrypick out of my reply?
I'm disinclined to invest overmuch effort in conversations the other party adamantly and gratuitously refuses to keep civil.
Dreams are influenced by desires and memories of the previous day. What weighs on Yuu's mind would influence it.
Ie. Touko and their relationship. But it does in no way automagically follow from her somewhat vague but distinctly erotically charged fantasizing the night before that she'd have full-on PG-18 wet dreams afterwards (I get the impression she's altogether too vague on the nitty-gritty of the whole business for her subconsciousness to have much to work with there anyway); "dream logic" is proverbial for a reason.
But frankly I don't even care. That is mostly irrelevant to my point.
Didn't stop you from trying to cite it as evidence, which struck me as a tad far-fetched. ¯\_(ツ)_/¯
Rather this is another point for Yuu still being innocent/naive, because she thinks it`s a big ask to demand to come to her senpai's place like that. Just another hint that she was thinking of a legit sleepover.
Or equally just another hint that for all her relative maturity and level-headedness she's fundamentally a kid of, what, 15-16 with no real idea of how to actually go about any of this and all the due baggage of uncertainty and anxiety that comes with the whole shebang. Hell both of them are still second-guessing themselves about what the other wants and is cool with, what they themselves want, and how far they "should" go with the latter (and for that matter let their imaginations wander).