Go on a munchies mission a la Harold and Kumar. Watch the Led Zeppelin Live DVD. Have a deep conversation with a close friend. Sit in the dark with Dark Side of the Moon playing. Listen to jazz and smoke some reefer, like the good old days. Go for a walk in the dark. Play an instrument. Be creative; write something or draw. I can't draw very well but I love it. I sometimes like to just put on my headphones and listen to one specific band or album, drawing whatever images are conjured by the music. I have a Rolling Stones and Led Zeppelin one pinned up on my wall at the moment. It's very fun. Eat continuously (this one usually wins).