narcolepsy
"I struggle with the Lethargic-type Depression. 

The Symptoms: lack of motivation, laziness, apathy, a-sociability (not caring about having others or relationships; NOT the same as anti-social), flat effect, low energy, excess sleeping, difficulty processing and connecting-the-dots; like when reading things for example, poor concentration, lack of drive, staying at home all day doing nothing, not getting a job, lack of determination and perseverance, giving up easily, low attention-span, etc. 

Ritalin works great for "Lethargic Depression", and even MORE so when combined with my Cymbalta (60mg once-daily).

I take 20mg in the morning, and I have a lot more energy. Just cleaning the dishes doesn't seem like an exhausting burden anymore. My facial expressions and effect don't seem flat, zombie, stiff and mask like. I can process what I'm reading more clearly. I CARE more and FEEL more. I feel motivated, and more active, no longer just sitting and watching TV all day, letting the house turn into a pit. I'm being productive, I can keep many things at the front of my head without forgetting. Overall I've gone from the walking, living dead -to-
a living, happy, productive person.

Overall, I take 90-120mg of the regular Ritalin (methylphenidate) in divided doses throughout the day."