I have mild to moderate narcolepsy, no cataplexy. I sometimes hear the beginning of a sentence, fall asleep in the middle, and wake up in time to hear the end.  I like to wake up early in the morning and stay up late at night--just not so late that I require a 90-minute nap the next afternoon. So I like two naps a day--one around 3 or 4 hours after I wake up in the morning, and another after 2 pm--if I can hold out till 3 or 4, that's even better.  Your tapes are great because they don't distract me with music I would listen too, or some mood thing like rain, and because the frequencies are fairly low, more like a cat's purr than artsy stuff (which has its own place, just not here).  Without music to think about or noise to be annoyed about, I can just watch the movie, which usually turns into a dream.  The length of the one I choose depends.  Which tones I prefer depends.  I'm amassing a collection whose effects I can sort of predict.  The 20-30 minute ones are good for when I had forgotten to take my ritalin and, having taken it, need to nap until it kicks in.
Cool, thank you for sharing!
Adeeba Zaman