If I had sleep problems only twice a week I would consider myself cured of insomnia. I have chronic insomnia though. I've had it my whole life. Even as a little kid I would watch the hands of the clock slowly move by, eyes wide open, 2am, 3am, etc. Nowadays I can't fall asleep until the sun comes up (6-8am) if I sleep at all. And I have full time work and school to contend with.

I think intermittent insomnia means having prolonged periods of insomnia (like weeks or months) and also having periods of normal sleep in between "episodes". A few hours on day or two here or there doesn't sound like intermittent insomnia to me.