I'm Roxanne, and am one of those odd outliers: diagnosed with narcolepsy (no C yet, thankfully) 18 months ago, just after I turned 54. I started falling asleep during meals, at movies, etc., and went in for a sleep study. Did the standard overnight, but then stayed for a SLT and BOOM! Slept thru all the nap cycles, and hit REM in under 2 minues on 3 nap cycles Did the SLT on a Friday and it took me until Monday morning before I felt fully awake.
The diagnosis was a total shock - both my parents have sleep apnea, so I figured it was something like that. After talking to my sleep MD, it's now clear that I've had narcolepsy since my teens: couldn't stay awake during lectures, no matter how interesting it was, falling asleep in the middle of parties, sitting at my desk at work not remembering driving in, etc.. Recently I've been having problems with mental focus and memory, and was concerned that it was early-onset Alzheimer's (my grandmother died from complications of Alzheimers that developed in her late 80's - silly but when your thinking gets fuzzy you believe ridiculous things). Diagnosis of narcolepsy was actually kind of a relief.
FWIW I'm a research scientist, and both narcolepsy and modafinil (currently 500 mg/day, probably going up to 600 in the next month) have made my work life horribly difficult - I can't think as well as I used to, and my co-workers don't really understand just how hard it is from day to day. I'm also working on my PhD, and have had to cut back from full-time work + school to 75% time work + school simply because I can't keep up. It's also been hard on relationships, so I've been looking for a group like this for coping strategies and just plain ol' support (I was also widowed at 42 (my 36 year old husband died in my arms of a pulmonary embolism), and the YWBB was so very helpful for me dealing with acute grief).