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I have very similar experiences. I am not sure if I have the typical strain as seen on this board. But I have noticed more issues in my occipital area and neck and sometimes in the eyes like you describe after sleep. Its usually worse if I use monitors more than usual or if my issues were overall worse that day and I pushed through. Sometimes opening my eyes at night the issues may start feeling better but I often feel better after standing.
I also get discomfort or pain from non LED sources. Mostly glare light off a shiny painted wall or certain overhead lights, usually if there is a glare and light through the windshield during the day. Direst sunlight doesn't seem to bother me. Mostly from screens and some are worse than others.
I also just discovered today that if I use black and white setting on my BenQ Eye care monitors I get more relief. I will be testing this more.