I was wondering if its possible to mix the two?

For 4+ years, I've been on Concerta 18 and Adderall 25, one each in the morning and late afternoon. Works great for me. Also take Wellbutrin and Cymbalta. The stim combo gives me the best sleep I've ever had. I know that seems counterintuitive. It doesn't make me drowsy, but when it's time to go to bed, I can lie down and focus (I suppose) on going to sleep. Especially if your doc recommends it, I urge you to give it a whirl.