Carbonfiberboy You bring up a good point. It is possible the main culprit is l-theanine. Since I started to take both at the the same time, I decided to go cold turkey on both. I might re-introduce one at a time some time in the future, but I am happy to have eliminated the deleterious side effects. I do take ~300-500 mcg of melatonin, which helps most nights. Thanks for the reply.