If it's MDMA then you should be able to sleep shortly after the peak wears off. Usually 1-2 hours but then again... usually I can get to sleep right away if I want to. If you find that 1: physical sensation is dulled and your skin is not ultra sensitive but rather plastic feeling (almost numb) 2: visual acuity is up but things don't appear pastel like (or chalky... which in either case, you might not be able to see the finest details in a persons face, which you probably shouldn't if you got MDMA) 3: insted of a welling up with emotion and blurting out "I feel great" or "I love you guys" you talk off the top of your head and can't keep up with your words and 4: get rushing sensations and go into sitting fetal pose while clenching insted of feeling calm and floaty/fluidy (as is common with psychedelics, which MDMA is) and almost feeling a drunk like inebriation allowing you to break down fear and emotional barriers but without the stupor of Alcohol... then you probably got Methamphetamines.

Well, I just described two very similar drugs for you, so that you can hopefully make an informed decision on which you got in your pill. It could contain any number of other things but they would be more noticable but people who try Meth their first time could confuse it with MDMA when it's unknowingly (by the user of course) pressed with Speed. But you'll know what it was for sure if you REALLY can't sleep... the next day you'll realize that food is actually disgusting... you'll know what it was then.

HEY, I HAD TO FIND OUT THIS WAY... It won't happen to you, man!1 (Oh wait, it might have already.)