I don't have much to offer on the subject except that I've noticed that since I cut down on my sugar intake I've got much more energy. When I have alot of sugar, I wake up the next day feeling very sluggish and am exhausted by early afternoon. Another thing to consider is that maybe you're getting acclimated to your medication, and it's time to be reevaluated and see if the dosage should be changed. Feel better, Pam.