Have this one, usually it happens every few years; I've correlated it to stressful / extreme tiredness situations. For me it's always: All black -> loud bang -

Have this one, usually it happens every few years; I've correlated it to stressful / extreme tiredness situations. For me it's always: All black -> loud bang -> flash of light A few times there were a heat sensation, tingling. Once I hard punched a friend who was sitting beside me after "waking up":/