When I watch drama and then go to sleep... in my dream I am one of characters of that drama and interacting with other characters. It has similar feeling like watching one of the episodes. Last time it happend to me was after watching many episodes of 'The tale of Nok Du'. In a dream I was Nok Du dressed in female cloths, trying to infiltrate some fortress to rescue my beloved Dong Joo. Then I realized that I was watching it too much. :D