Greek Mountain Tea Contains Caffeine?

I would like to know if Greek mountain tea has caffeine and if so is its content high? I make a concoction of Greek mountain tea, fennel seeds and star anise. (Pretty good tasting.) This combination seems to work best for me in preventing acid reflux.
In addition to Prilosec I used to take Pepcid AC daily, and at least six antacids (at night) before retiring and occasionally Donnatal. Now, I take about six antacids a month although I am leary of giving up the Prilosec.
My problem is that I can't seem to get to sleep until 1:30 or 2:00 a.m. and I'm not sure if it is due to one of these herbs containing caffeine or if it's just a bad habit I have gotten into.

None of our sources have information on the chemistry of Greek mountain tea, Sideritis syriaca.
Our own experience with the tea suggests that it does not contain stimulating caffeine-like compounds. In Greek culture where the herb is routinely offered as a treatment for colds, it is not regarded as having stimulating properties.