Bright white then sleep

Before you come and section me please read in full and I welcome ANY explanation..so here goes..bored one night I decided to try and make my closed eye pre sleep mind state that was very dark..to go as white or as light as my mind could make it..and after very little trying it did..but.....when I tried to hold it white/light I shudder all over my my head whistles and I get a prickly excited feeling all over. I woke up remembering the feeling...and I'm hooked on making it happen. But the problem is now when ever I blink or close my eyes the tingle and head whistle are becoming more and more frequent and I cannot find anything at all to explain what I've discovered or how to control the severity of the tingle/excitement that I can produce at will...ok..call the white coat. And help me discover what I've unleashed..