With the assassination and everything else, Matt doesn't have time to really think about the dreams until late afternoon when he gets a little downtime. By this time, he's heard a bit about other's nightmares and he knows that it's complex wide (at least for the Specials) which doesn't make him feel any better. In fact, it makes him feel worse because they're being manipulated.

At some point in the afternoon, Matt goes looking for the brunette in his dreams (and that alone was overwhelming because Matt has always been able to see in his dreams, but they're all old images or images that he knows his mind has created from what it does know, which isn't anything visual so for the first time since he got the implants out, he saw new things). It takes a little while to find her, and some describing her to several people. When he finally does find her she's on her way to her room. He stops her, suspecting that she knows who he is because of his dreams.

"Katniss?" he asks tentatively because he's got nothing to go on but visual cues and what everyone else has told him. The visual cues don't do him any good.