Ever since I was at least 5 years old I can remember seeing thousands of tiny, multicoloured dots flying around my vision like TV static. They are much more noticable in the dark and when I blink or close my eyes.
There's aso always been a ring of more prominent redish dots in the centre of my vision that moved with my eyes.
When I was little I thought I was seeing molecules in the air after learning about them on an episode of Magic School Bus.
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Turns out there is actually a name for this phenomenon:
CEV - Closed Eye Visualisations
https://en.m.wikipedia.org/wiki/Closed-eye_hallucination
Althout apparently that is only supposed to be seen when you're concentration and dissapear when you're not but mine is just alwasy there so it could also be
VSS - Visual Snow Syndrome
https://en.m.wikipedia.org/wiki/Visual_snow_syndrome
The little dots are called phosphenes and theres been some really interesting research done on them and the different causes for them http://www.oubliette.org.uk/Three.html
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Whatever it is, its harmless and we don't fully know why some people have it more than others but it's nice to know I'm not the only one. I actually found a quora thread with a bunch of people talking about there experiences with it.
https://www.quora.com/What-causes-us-to-see-tiny-coloured-dots-in-darkness-For-example-if-you-are-in-a-dark-room-you-don%E2%80%99t-just-see-pitch-black-but-thousands-of-tiny-dots
So yeah. The more you know.