I know someone who is troubled by chronic insomnia....
The person hasn't slept...not really at least. In over a year...The last time they tried to sleep, they fell asleep for four days. And was taken to the hospital...they got the person awake, but told them if they didn't they[the person] would have gone into a coma...the person has already been in a coma so their heart isnt that strong....the next step after a coma could be death...

the person has gone back to sleep.....whats the probability like that they will wake up back... =(