If you've had a proper session and no sleep you're body would be run down and more susceptible to colds and what not.
If anything I find MDMA a miracle medicine, I've taken pills when I've had stinking colds, come the next day the colds gone or virtually none existant.. Not sure if I've just sweat it out of me or what but it seems to work for me..
Also hay fever, forget antihistamine, MDMA is the best cure for it, I suffer from it quite bad, take some pills and it just stops, no more hay fever.. Obviously you can't do that everyday but ecstasy saves me at festivals from been a sneezing mess.
Does anyone else find this or is it just me?
Good luck in your exam mate