Meredith, years ago (pre-paraliminals) I used to have your problem. The way I handled it (eventually, after lots of trial and error) was to keep VERY busy during the day, and at night, settle in with a book that wouldn't activate any stress (in other words, not the best time to read your favorite mystery or--shudder--true crime book). Even, and maybe especially, a boring book. Within weeks, I was sleeping like a baby.

Taking your mind off of your problem (staying busy all day, reading something at bedtime) goes a LONG way toward resolving the problem.