<prompt> Modafinil is approved by FDA for treatment of all, except:NarcolepsyShift work syndrome SWSObstructive sleep apnea syndrome OSASLethargy in depression  <response>: Modafinil is an FDA approved drug in the treatment of obstructive sleep apnea, shift work disorder and narcolepsy. It is not FDA approved in the treatment of lethargy in major depression. Ref: Sleepiness: Causes, Consequences and Treatment By Michael J. Thorpy, Pages 415-6 