question: My husband has had w/u for sx of lightheadedness and ongoing fatigue.  Has had 2 sleep studies  and uses CPAP, sleeps 7-8 hous/night, had sinus surgery 2.5 years ago and has been sinus infection free since....but continues to c/o lightheadedness and fatigue throughout the day.  He is taking Benadryl each night as a sleep aide and to help with allergies.  Also takes Lipitor and Valtrex.