Have a look for my thread on insommnia (dont know how to link it)
Melatonin sorted me out...1mg a night (a quarter of a chewable tab) It's all to do with something about the change in hormones.. too much cortisol, and you don't 'make' melatonin like you used to. (Gee, thanks Meno, yet another horrible symptom of ageing).
Never slept, or felt better since I started taking it. Its completely natural and safe, re- sets the natural circadian rhythm, so no groggy feeling in the morning.
PM me for the one I use