What is kleine-levin syndrome?

Hi,
I have heard about a disease which my friend suffers from. My friend his name was **** use to sleep a lot sometimes he sleep across a week which is quite a big headache to all his family members. One day his housemates thought that he is dad and start crying...but soon after a day at the time when his body was going to be burried in land he got wake up and all the people start screaming he is a ghost..and all the stuff like that but i understand his problem and take him to the doctor. Doctor didn't able to explain it actually what he was suffering to then we research on NET for across a month and we came to know that he was suffering from Kleine Syndrome i didn't able to find out the preventions and i hope i found something interesting out here.

thankyou,

In short, I don't know and actually heard it for first time.. :)