[appplication]

I have, for many years, experienced sudden loud buzzing/sine tone sounds accompanied by vivid monochromatic zig-zagging phosphenes (as I have more just learned they are called) when I’m in the process of falling sleep and suddenly jolted awake by some external stimulus (a sound, usually).

These appear to last just a fraction of a second and are rather jolting. I wonder if my mind was “playing” these sounds and sights as part of the normal sleep process, and the sudden waking just raised my consciousness enough to catch a glimpse of them.

Anyhow, thank you for sharing, I have long wondered if this was a known phenomenon, and now I have a name for it!