Well, after an all-nighter, and a ack of sleep which after about 27 hours, I get, how you say, less myself. Meaning I am no longer fun loving, and more correctional. So I fell asleep at 9:15 PM, and woke up at 11:15 am.
Right now I don't feel like doing math, but I'm gonna estimate that 14 hours.
Correct me if I'm wrong.