"I was asleep." That's not entirely accurate. 'Passed the fuck out' is more like it. He doesn't actually remember much of the night before that but, really, that's fairly standard for him.

Walter inhales slowly for a moment, keeping most of his thoughts out of his expression as best he can - that mostly just translates to his jaw being set in a particularly hard line. He'd rather not, honestly. He wants to just awkwardly escape back to his house but that's not in the cards. Eventually, he gives. "Yeah, alright."

At least he won't have to deal with Weyoun being right there.