"I've accepted that we're all sharing dreams. I've even accepted that certain people are experiencing phenomena related to the dreams - Tony's suit, my metabolism. But until last week, I didn't think it would be anything." Steve stopped to search for the right word. "Anything so dramatic. So I didn't want to burden you guys with ramblings about Nazi scientists and alien tech."
But since 'dramatic' seemed to be fully possible, withholding information out of embarrassment seemed like a selfish and foolhardy thing to do.