@Schniepel

I know lots of people who do Ecstasy, some who only do ecstasy and others who are poly drug users the people i know have been useing from anywhere between 1-15 years. the ones who have stuck to ecstasy in my experience have no noticeable symptoms that would suggest brain damage. The poly drug users who do hard things like coke, pcp, meth, crack, or heroin... those are the people who you look at and are just like WTF did u do to yourself...

Why Ecstasy? well first of all i dont think people take Ecstasy simply to stay awake, although staying awake is one of the sideeffects.
MDMA causes increases of sensitivity to sight, smell, touch, taste, and hearing. also ecstasy seems to instill a sense of empathy into those who take it, which makes the user tend to see the good in everything.