I'm sensitive to some meds, but even more sensitive to a medication I took for chronic diarrhea: Elavil (amytriptyline).
Though it's generally prescribed for depression and related, my GI doctor prescribed it for its strong side effect: very drying.
Even a small amount (25 mg) taken before bedtime made me sleepy for most of the next day! And I "slept like a rock" every time I took it.
I don't know if this was just my experience or if it affects everyone that way, but it sure made me sleep!
Both chamomile and valerian teas are supposed to help with sleep. Puritan has something called "Calm Tabs" which contain valerian.
Hope you find something that works soon.