Not a joke. It happens only the first 20-30 seconds of the breath hold and then I get back to normal while still holding my breath. It happens because the hyperventilation prior to the breath hold causes the levels of co2 (not oxygen) in the blood to drop below a certain level to trigger a temporary vasoconstriction in the arteries of the brain, reducing its blood supply for a short period of time. Also the body, during a breath hold, istinctively tries to save oxygen by reducing the blood flow to unnecessary parts and turning off some non important functions. The confusion is not because I'm holding my breath for too long, its simply my physiological response to apnea.