I have the same problem man. I usually take 3 or 4 rips from my bubbler an hr before bed and Im out within 5 mins when I lay my head dow. When I don't smoke, It takes me a good 2 or 3 hours to fall asleep.... I feel your pain..
Same. When I don't have weed really the only times I really want it is when I get bored or when it's night. Just the idea of going to sleep sober is ridiculous. If I smoke I can go to bed easily at like 9 and sleep until 6 or so without waking up but if I don't smoke it's impossible for me to fall asleep until at least 2 AM and the later I stay up the more bored I get and want weed more.
I also smoke weed to relax half to one hour before bedtime... I also listen to some ambient music @ http://isleepbetter.com. They have a free book with some tips that might help you!