Like the above poster I would also suggest putting exercise in your day if you haven't already.
It might not work for you, but if others come here looking for insomnia related treatment, I would suggest trying valerian root and/or chamomile before sleep. Also: hot baths, not having electronics on in your room, not playing online/watching TV at least an hour or two before bed, using your bed only for sleeping and sex (no reading, watching tv, going online, etc.).