The best thing to do is just give up and stay awake. If you try to force yourself to go to sleep, your mind will eventually start thinking that it can't sleep in your bed and you'll have more issues.
Also, avoid napping during the day if you nap. Avoid caffeine after noon. No meals within 2 hours of going to bed.
I had to hear all this stuff a couple years ago when I had the same problem. They ended up prescribing me Klonopin(?) for the off label use of knocking me out.
If it gets to be too bad, a doctor trip may be in order.