narcolepsy
"I was diagnosed with Narcolepsy while ago and have been started on Modafinil. This does work, but with some side effects, which I tend to find only if I take the whole 100mcg at one go, rather than have it in two's. By separating the whole dose it has helped with the headaches and increased heart rate. I don't take it on a daily basis, but only when I am at work or at Uni. Another brownie point for this medicine is that it definitely curbs my appetite for hours."