This is a really old thread! But I when I googled 'past life narcolepsy' this is one that came up. Funny, right?! Anyway.
While I do not believe that this article holds true in all ways, I believe it brings up some valid points, but more so generalizations. For anyone who believes in reincarnation, they generally believe in karma and that we're here to learn lessons. These lessons change throughout our many lifetimes, etc.
Personally, I think that Narcolepsy (and most everything else in our life) are here for a reason. Perhaps it is due to emotional patterns, like this article says. Or perhaps it is there so we might follow a certain path in life. Narcolepsy in general requires that we (PWNs) slow down. It's just not possible, even with medications, to go at full speed with the rest of the world. This really allows us to learn 'prioritization'. And I think all PWNs know this to be true. Since I can't do everything a normal person can in a day, I have to prioritize what needs to be done and what can be put on my 'to do tomorrow' list. It also allows us to really only include in our lives the things that truly matter. And this will be different for everyone. But again, it's about prioritizing things. So for some people, art may be really important and they have to make that fit in to their lives, and due to Narcolepsy, perhaps education isn't as important so it gets put aside. Others may find family and friends to be important and they include those but perhaps forgo a 9-5 job.
I think in general, Narcolepsy is just something that allows us to be more in tune with ourselves, since we do have to slow down. It also gives us a gateway in to our dreams, and that brings out a lot of things - perhaps astral travel, or just creativity. These are more important for some souls than others, and thus may be more pronounced in some people. Cataplexy, too is something that affects our souls path. There are people with N and C and those with N but not C. How odd is that?! Well only odd enough to allow cataplexy to affect those who will receive some benefit (yeah I know cataplexy doesn't seem like a benefit but...) to their current incarnation. For one, it is just one more reason to slow down. Another, many people learn to control their emotional responses to hopefully avoid major C episodes and possible dangerous consequences. And on an even more obvious note, Cataplexy is something that doctors see and automatically associate with N. For some people it may be necessary for diagnosis earlier in life, and this factor can be a benefit when getting a diagnosis. Whereas others, perhaps diagnosis is more beneficial later in life and thus cataplexy may not be so necessary in this incarnation.
I just think it's very interesting stuff. I personally don't think of karma as good or bad. It's not that I do something bad and then must have something bad happen to me. It's more like, I need to learn this lesson and this person can help me learn it. And we play roles in the incarnations of others, so it may be necessary for me to 'help' someone by saying something mean or whatever, even though it doesn't seem beneficial, it may lead to something in their current soul progression. And perhaps I just need to learn how to stick with life and know that I'm a strong person and am capable, and thus I need a tragic life to show me that. Or if I'm learning about persona and ego, I may have a very materialistic and 'easy' life. It's not good or bad, they just have difference outcomes that teach us something we needed to learn.