I don't remember the name, but I had headphones, and stuff stuck to my head with gel, and glasses that would flash lights through my closed eyelids. The part I

I don't remember the name, but I had headphones, and stuff stuck to my head with gel, and glasses that would flash lights through my closed eyelids. The part I remember most is it taught me how to "relax" parts of my brain in ways I hadn't before, and which I can do now on demand without any hardware.