I exercise daily; walk daily; line dance. at a senior center 2-3 times/week unless I'm hit with a bout of fatigue. I am not depressed. I cannot take antidepressants. While still working, my primary gave me a Ritalin generic (5 mg.) which I only used "on occasion" for my ADHD, but saidg he wouldn't give it to me after I retired. I only took the pills "on occasion." I can literally have an espresso (or two or three) and go right to sleep. The Ritalin generic simply helped me get through my last years of teaching (again, I only took the pills "on occasion;" never wanted to become "dependent"). I realize the stigma due to the a abuse of this controlled substance, but despite my daily exercise routines (done religiously), line dancing, gardening, dog walking and the usual, day-to-day "to-do's," when fatigue hits me I can sleep 12 hours and still get up tired.