I do this to my boyfriend sometimes. So far no success . . .

I should probably inform him that he's dreaming the next time he talks in his sleep (usually I just talk to him about the dream he's experiencing and pretend like I know what's going on). But I think that if I just told him, "You're dreaming," he'd just wake up because when I ask him too many questions about his dream he wakes up. But maybe I could say something like, "Hey, this is weird . . . it's dreamlike."?