thats because its a speed and is only for short term and thats why kids and teens are using adderall as a party drug..... vyvanse like balances it out to where you are a tiny bit hyper and a lot happy and just enjoying life and you feel like yourself like you are finally comfortable with yourself and it was really weird when i first switched cause i was taking concerta my whole life and i never felt that feeling trust me you will be amazed at the difference it makes like when i started vyvanse i finally had the ability to fall asleep on my own because it would slow me down and i was taking naps for no reason because id wake up happy because i could finally do it like it dont make you tired at all it makes you feel "normal" like everything is the way its supposed to be and you feel like everyone else and you dont feel like you stand out anymore like it was so weird for me but it was a really good weird because it was new experiences like you know when you hyper and you just wanna run and do everything but you cant so you feel isolated ... you dont feel isolated anymore you feel free ...trust me youll like it a lot more that adderall