I've never had insomnia, but I've had times I had trouble falling asleep.
Wait, ok never mind that (I'm still half asleep, I think).
Two suggestions for you Amy:
Humorous: If you walk around half asleep for 16 hours a day, it's the same as getting 8 full hours.
Serious: You may be tired, when your body absolutely needs sleep, it will allow you to sleep. Don't worry, it'll happen.
Chris