My doctor never told me I had to take Vyvanse every single day so on the weekends I may not take it. I decided today not to take it. I got up at 11am since I worked the night before and didnt get off work til 3am. By 1pm I was super tired and went to lay down for a nap and didnt get back up until 630 pm and that is because I made myself get up. I have noticed anyother time I dont take it I feel extremely tired. Is this a normal side effect to not taking it?