Well, I'm not really sure she's my stepmom, my parents divorced a few years ago and my dad married this woman last summer, dunno if that counts as stepmom since my real mom is still alive -.-
Anyway, she has no energy all the time and sleeps quite a lot. She's on a pretty strict diet tho, which allows her to lead a pretty normal life. She just can't go out and do "intensive" stuff like play with her kids and such, or party.
There is indeed no known cause/cure. It can just go away :O
It's a pretty bad condition but the girl you're talking about doesn't have a really severe form of it, she can still lead a pretty enjoyable life.
, nor do I