Not eating and not sleeping.... but mostly I don't notice until I find myself tossing out all my teaching plans to do something new! Or when I all of a sudden just cannot abide the idea of hanging out on my own and want to go OUT RIGHT NOW and feel like that 24/7. Also if I've just randomly babbled someone's ear off who isn't a close friend... and likely if I've overshared something... then I go "oh....ummm".