Hi: I Take VYVANSE also and love it to.But one thing i did notice, if your mg is to high you would know. Your pressure would go up or you can't rest at night.But the meds is great it self,I can really do a lot of things i couldn't do in the pass.such as focus concentration,memory has inhance.Being able to communicate with others an not being scared of what comes out of my mouth.LOVIN THIS ONE!!! OH i do have my caffine every morning[but not after 1:00 pm.THAT WILL ALSO STOP YOU FROM RESTING AT NIGHT