Wet dreams

Banta complained to a doctor that he wetted his bed every night. "Before it happens, do you see any dreams?" the doctor asked. "Yes, doctor. Usually I see a dream in which a small demon comes and says, 'Let's pee.' "OK," the doctor said. "Next time you see the demon, say, No, we've already peed." Next time Banta came to the doctor, the latter asked, "So, did you do as I said?" "Yes, I did." "Did it help?" "No, doctor. Only, it made the matter worse." "How?" "As I said 'We've already peed,' the demon nodded and said, 'Then, let's shit a little.'"