narcolepsy
"After years of misery; then numerous tests by neurologists and sleep studies I was finally diagnosed with severe sleep apnea and a form of narcolepsy in 2005.  I was prescribed Provigil, 200 mg twice a day and given the okay to take another 1/2 tab if necessary.  It was a Godsend and changed my life for the better.  However, now Doctor wants me to "try" Nuvigil and gave me samples and prescription.  It DOES NOT WORK for me but insurance company is demanding I stay on Nuvigil. Provigil will cost $1000 pr/mo! "