Specks of light covering the sky

[Coordinate_Apotheosis]

Maybe this:

https://en.m.wikipedia.org/wiki/Blue_fie...phenomenon

I can verify that this is not the same phenomenon, I have experienced the described phenomenon given here individually from the phenomenon the OP describes.

However, it's awesome knowing this too, so thank you for sharing~

I most vividly recall experiencing this entoptic phenomenon during a head rush, when blood rushes to the head.  I always thought it had something to do with the blood vessels in the eyes.