If I take 70mg of Vyvanse and I fall asleep within 1-3 hours after taking it, does that just mean it has stopped working completely? My doctor keeps telling me it's not that easy for 70mg to lose it's effectiveness. Dry mouth, suppressed appetite and other side effects have subsided so I don't "feel" like it's working anymore like I did before. However, I do feel these things when I take a 20mg tablet of Adderall but I thought 70mg of Vyvanse is supposed to be way more powerful than one 20mg tablet of Adderall? Perhaps I've deluded myself into believing that the Vyvanse doesn't work?