I always have problems sleeping on Concerta regardless of the dose or what time I take it. I have taken it off and on for years and that side effect never went away. I did not take it combined with Welbutrin but would think that would make insomnia even worse. Vyvanse, however, lasts much longer for me but does not give me any problems with sleep. So, I would give it a little time maybe a few more weeks, then move on and try something else. I am really happy with Vyvanse but had to do a lot of work on dosing to get to the right spot. Good luck.