Well it had been worth a shot. He isn't actually sure how his ability to effect minds interacts with the fact that the subject would be dreaming, and it would be something worth finding out. He wouldn't even have wrecked anything this time. Probably.

"Suit yourself. If the experiment works, of course." He doesn't intend to memorise any numbers, not that it would be especially difficult. He hands her back the paper and pen, still without checking it. The general gist of his abilities isn't exactly a secret, at least to innocuous strangers, but being cagey about why he wants to know the things he wants to know had seemed prudent. But if she's got any cleverness she'll realise that dream paper (and its contents) should normally stay within the bounds of the dreaming. Oh well.