i have a chronic problem with insomnia, here are things that help me when i get into a rut of no sleep:
1. routine - get into one, so your body knows when it is time to rest. plus, a regular time of rest, even if not sleep, is helpful. go to bed same time every night, get up the same time. it helps like crazy.
2. be physical - lots of people here said it, they're right. go for a walk after dinner, bang your girl, lift weights, do pushups. whatever. get your heart-rate up for 30 minutes, you'll sleep better.
3. most important - see your doctor about a sleep aid. ambien does the trick.
sucks to not sleep, i feel your pain.