Narcolepsy
"I started taking Provigil about a year ago when it was suspected I had narcolepsy.  I was tested and found it was Idiotic Hypersomnia (lack of melatonin) they call it Idiotic because they don&#039;t know what causes it. Provigil works one day for me then not the next.  You can only take 200mg max per day. I went off it and on Ritalin.  I am awake without any ill effects.  I have recently been tested again for narcolepsy and was found that I am narcoleptic.  The test given last year was done incorrectly (without my C-pap), it was supposed to be done WITH it on during my sleep study. All is good now."