I did my deep relaxation exercise last night, and had my entire body numb. I got a sudden heat in my feet and then I think about 10 minutes later when I started to get more and more relaxed, I think this was a precursor to what ended up happening to my head.
Basically out of nowhere I got this intense flame of heat that enveloped my entire head, along with these vibration'esque movement that absolutely scattered my vision. I had my eyes closed and it looked as if the darkness went from being normal and showing me various shapes and objects, to being like when you degauss your monitor, it flickers and moves around a lot, as if someone smacked you upside the head (minus the pain). I'm 95% sure the heat went from the top of my head down.
This happend about 4-5 times. It wasn't bad...just intense. I was trying to telepathically talk to my Spirit Guide previous to this, and believe I was succeeding on some level.