You may want to check out the adrenal fatigue forum here in CZ - inability to sleep or better yet: sleep for a couple of hours then wake up and not be able to fall alseep is very common with adrenal fatigue.
Just a possibility.
One thing that some people have reported to be helpful for sleep: GABA
For me taking B12, B-complex, & Chloroxygen (chlorophyll) and Briar Rose extract had an immediate effect in conquering insomnia - due in part to adrenal fatigue I suspect.
I no longer take the Briar Rose or the Chloroxygen - and still sleep through the night after two years or so.