I don't know what it is but blacking out and then waking up with the worst hangover, so nauseous that I can't even eat breakfast, is a mentally stimulating rush. It's like turning off your brain and then kickstarting it. I woke up today and was immediately bursting with energy. I feel like a very enthusiastic cancer patient. I also woke up today with a new love of life, and myself, and while I still detest other people generally and specifically, I love that about myself, too. Life is good. This puts a new spin on "the spirit is willing but the flesh is weak".