According to this link, a gene is responsible for extremely excessive sleep in some people.
Interesingly, the gene is apparantly existant in everyone, but is only fully expressed in a few.
That is interesting. But if this is genes-related, can this be cured? I know it sucks to be sleepy everytime. Imagine spending your life more asleep than awake? )
I have an illness that makes me almost constantly sleepy, I even fell asleep on the back of a motorbike once (won't be doing that again!). It's not all bad, I get to snuggle up in bed when I need to with my pets.....and of course, I am beautiful ....well so my fiance says. I'm not so sure when I wake up with dribble on my pillow.