obstructive sleep apnea/hypopnea syndrome
"I suffered with obstructive sleep apnea for 20 years, surviving on 1-2 hours of sleep per night.  I would fall asleep everywhere, even fell asleep in two job interviews!  (didn't get those jobs)  I got my CPAP and it helped a lot, but I was still sleepy during the day.  Then my doctor prescribed Nuvigil 150 mg and I woke up for the first time in 20 years!  I'm 53 and I haven't felt this alive since I was a kid.  Week 1 I had a small headache and insomnia,  but then my erectile dysfunction went away, my memory greatly improved, I stopped falling asleep in meetings, and even my essential tremor, which runs through every male on my father's side, has all but disappeared.  For me, Nuvigil is truly a miracle."