[QUOTE=My partner is mildly narcoleptic...a lifelong disorder that causes him to want to sleep if his body is still...driving, watching a movie in theater, etc. He has low blood pressure (which is aided by cycling fitness.) That's why he bikes..it is partially to re-energize his body. He has been tested at a sleep clinic at hospital..twice in his life.[/QUOTE]

Shootingstar that is interesting stuff you mentioned because my father was diagnosed as having narcolepsy and he and I have a lot of similarities to your partner in that regard. My father and I both have low blood pressure and slow heart rate. I too have to be VERY careful driving. When I am tired I have in the past fell asleep at the wheel. I nearly wrecked my car on a handful of occasions. My father DID wreck his car and miraculously survived without a scratch. Apparently a truck driver saw him wreck and the car spun out of control about 6 times before spinning into the median of the interstate. That being said, when I have long trips now I try and take someone with me, drink a lot of coffee or take the cat b/c she meows occasionally and RARELY use the cruise.

I always notice how much more alert I feel after I ride or run. I'm sure other people feel this too but I don't think to the same degree. I say that because sometimes I honestly feel intoxicated some days until I go run or ride. It's strange and a little unnerving since my father was also diagnosed with early onset Alzheimer's Disease a few years ago. I really hope those things are not connected.