HOLLYWOOD, May 15, 2000 -- CANNES, May 15, 2000 -- There are two sides (at least) to everything, right? For example, at the exact same time you want to keep dancing at the tres late rooftop party, you also want to fall asleep for the next 18 hours. At the same time you want to do yoga, you long for a warm chocolate crepe. Marlon Wayans wants to be here to celebrate his role in Darren Aronofsky's (his post-"Pi" flick) new movie, "Requiem for a Dream" at the same time he has to be in Los Angeles