For insomnia, THC is the main player.
Here are a few quality products to consider:
http://kivaconfections.com/products/petra -2.5mg THC/serving
http://sensiproducts.com/product/sensi-chew-insomnia-with-melatonin/ -10mg THC, 4mg melatonin/serving
http://kivaconfections.com/products/bars -5mg THC, 5mg CBD/serving
Some strains to consider:
Grand Daddy Purp
Hope this helps!