Follow-Up: I have sleep apnea and hypersomnia. I am also a diabetic. I have been taking Provigil and feel like a million bucks. I started at 200 mg. which seemed to make me really tired. My doctor said to try 300 mg. That made me sick. I tried 100 mg and I was sick and tired. Voila!!!! I tried 400 mg. in the morning and I haven't felt this good in years. I'm alert and have no desire to crawl into bed and stay there. Try different dosages with the supervision of your doctor. Good luck.