hypersomnia
"Of all the different ADHD meds out there the dextroamphetamine works best for me. I don't get shaky or jittery while on it. I take it very early in the morning because it takes at least two hours for it to begin to work, I can't get out of bed until the dextroamphetamine begins to wake my brain up.  In fact I sleep very deeply while on this medicine and wake up feeling very rested and alert. I don't know what I would do if I didn't take this to wake up, without it I sleep 18 to 20 hours a night and still feel groggy and in a haze when I do finally get out of bed."