I actually realized recently that magnesium causes me insomnia though I'm probably the odd one here. I believe I have ADHD paradoxically reactions). However, I thought I would mention it in case it would be contributing to your not being able to sleep.
Again, paradoxically, I did find calcium hydroxyapatite added to my tart cherry helps with sleep.
Also, I get these tremors too and found that small amounts of ginkgo help a lot. I've read that too much of it can cause tachycardia so only take small amounts but I'm so sensitive to things that it works.
Another thing that seems very calming to me is Cordyceps. They're supposed to help with brain inflammation according to this website:
https://dailyhealthpost.com/cordyceps-mushroom-brain-booster/
"A 2014 study published in Evidence Based Complimentary and Alternative Medicine showed that Cordyceps supplementation reduced inflammatory markers in the hippocampus of the brain. It also raised up brain-derived neurotrophic growth factor and 5-HTP (precursor to serotonin and norepinephrine levels). These results demonstrated that Cordyceps has positive benefits on mood and memory levels."