I may not even see the illusions. It's unclear - my second sight isn't fully something I can control... there are parts to it that are passive.
While I can "turn it on", so to speak, in order to peer past veils and the like --

[Fwip! Those "second eyes" of his open up, revealing dark, black pupils buried within his original cat-like one.]

-- Some invisibility and illusions are passively pierced by them, even when I don't activate it.

[And, again, fwip! Closed right back up again.]

... Dream manipulation, however, sounds like a likely course of action. There's no reason for me to hallucinate in a dream -
It's a dream, after all.