If they're mild enough, I can sometimes recognise my psychotic symptoms, especially auditory and visual hallucinations. That said, I can't always tell. I scared the poo out of myself in the hospital a few days ago when I thought someone was standing in the middle of my room watching me undress. It took me a minute to go "oh I must be hallucinating," because for a moment it was very real (and scary, I almost screamed!). I can't tell when I'm delusional either, which sometimes makes things difficult for people around me.