depression
"My depression is responsible for a sleeping disorder that makes it very hard for me to stay awake and functional: I have some kind of hypersomnia instead of the regular insomnia complaints patients have. Even though there are people that respond nicely to modafinil, I didn't feel anything while associating 200mg of it to my SSRI. I couldn't notice any improvement to my sleeping cycle or to my concentration. Side effects were absent too. Unfortunately it was not for me."