I don't believe in "insomnia" being a disorder. Insomnia is what people call bad sleeping habits developed over time.
I could have gone into the doctor and gotten official documentation saying I have insomnia ten times over by now.
It's the result of stimulating your brain, which makes you not want to sleep. *(Being on the computer, watching TV, working, etc)
I used to live with a friend's family, and my friends mother told us he had insomnia. She would lay in bed all day every day because of other illnesses, and she would stay up all night watching television.
I offered the advice to maybe stop watching television an hour before she wanted to sleep. And she accepted.
Over about a 1 month period, she said she was cured. Hmm I wonder why?
What I believe in, is the correlation between the heavy use of electronics and the lack of sleep.