Psychiatry Sleep Disorders c9a25592 Modafinil is approved by FDA for treatment of all except: A Obstructive sleep apnea syndrome (OSAS) B Shift work syndrome (SWS) C Narcolepsy D Lethargy in depression High-Yield Explanation Modafinil is FDA approved for: Narcolepsy Shift work sleep disorder As an adjunct in obstructive sleep apnea.