"i&#039;ve been taking vyvanse for about a year now and it has been an interesting trip. at first i couldn&#039;t sleep for the life of me and would go days on only a couple hours of sleep that i could get. then after a couple months i was able to sleep almost like i used to and i noticed that i was more mentally alert and energetic but, my appetite dramatically diminished to almost nothing and still felt like my body wasn&#039;t getting enough rest. on top of that, when i would skip a dose i would have extreme hunger where i couldn&#039;t eat enough and i would have terrible fatigue! after a year everything evened out and began to feel normal other than having no appetite, but i have a healthy food schedule so i don&#039;t forget to eat. i would also like to say that i think it should not be recommended for children!"