Random episodes since i was 16 years old, i am now 22 year old male, physically active, eat healthy, don't smoke.
Always happens when i have been sitting/laying, for any period of time, more than 1 minute. My vision slowly goes black, i lose awareness/memory of were i am and/or what i am doing. More serious times i start to lose about 50% of control of my muscles along with a delayed reaction. Example being, i tell my arm to move up, and it dose the exact opposite, i quickly realize my arm is moving the wrong was and try to counter it, resulting in a chain reaction of my muscles not listening and me slowly falling to the ground while it appears that i am seizuring. I never lose consciousness, just partially lose control of my body. I am a relaxed person over all, i have no medical conditions. I am more concerned now because it just happened again and it felt like someone stabbed my brain with a knife for a split second, it was very unpleasant.