The technique comes from neo-pagan(new age) spirituality. Which you mix together what ever beliefs work for you. Your free to reject and accept beliefs as you see fit. I’ll skip the spiritual aspects. This one is called the “Path of flaming sword”. Your mind will wander, expect that. Just refocus and continue on where you left off. Do this late at night and with fan(neutral sound). Find a time and place with no/very little distractions. It’s complex enough to keep an ADHD mind interested. Deep breathing should come naturally.
You visualize a point of light at a location on your body. You chant a word(s) over and again in your mind. The point of light glows brighter each time you say it. When you feel like moving on, you connect the current point of light to the new one with a glowing strand of light. Repeat the process. List order:
Just above your head, right shoulder, left shoulder, center of heart, right hip, left hip, base of spine, between the feet.
When the last point is finished, the first point glows with a blinding light. That light running down the chain like a fuse to the last point. While maintaining the previous connections, do this.
Using a word(s) chant to focus your mind, make a line of light going from the center of your body out to infinity:
center->left , center->right, center->down, center->up. Now chant the word again and again. Everything becoming brighter and brighter until you feel you are done. You have become a being of light. Wait there a bit more, this part is fun.
You continue chanting. You become bigger and brighter with word until the whole universe is now a pin prick. Another variant, you rise up and fly through roof out out into space with your body of light traveling faster and faster until you get that cool star trek warp stars.
I’v been doing this for over 20 years. This took a while to master. You don’t have to believe in the spiritual aspects. I understand the science behind this, but I prefer the spiritual explanation. “The spiritual equivalent of sticking your tongue into a light socket.”. I think of it more as being struck by lightning many times. 
This ritual can give a big rush/high the first time it’s used. Later, it still has a good rush. You should sleep much better for a few days. Also, the next part is specific to my spirituality and personal. Again, I understand the science behind that as well.
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