Once i didn't sleep for 2 days because i had to do a lot of drawing for my art exam(I studied painting in the university)the second day I couldn't think clearly and i went out with some friends and their friends and then went back home slept for 20 hours.when i woke up the next day, went out with the same people but I couldn't remember who they were and had to have them reintroduce themselves to me=))))) i was in a manic episode otherwise i wouldn't be able to stay up for 2 days and i got lots of work done and passed the exam =))))