The author, a healthy, left-handed, male medical writer with no epileptic disorder, was 37 years old when he inadvertently triggered an elaborate sequence of phosphene light-visions while he was trying to use his meditation skills to relax enough to fall asleep during early morning hours. He’d previously acquired a substantial sleep deficit, a condition associated with hyperexcitable cortical neurons. A reverse-engineering analysis of the phosphene characteristics—shapes, colors, movements, timing intervals and serial order—suggests new and otherwise unavailable insights about events taking place inside complex structures located deep in the brain which are difficult to monitor using the imaging technologies currently available . . .