not to interrupt your gents conversation BUT....i'll respond to DMW....i've been reading through some of the ideas, suggestions of what these 'darting light sperm-like, tadpole-like organism' may be. Many, many people, like myself, shared similiar sights.....mine happens to be typically INSIDE not outside, twilight light level (natural day light to evening to dark room with lamp on), i am in a resting state when i suddenly open my eyes and these small, lit, wagging tail organism dart/swim about. these are captured in my peripheral vision....these things 'swim' random, reactive to my lids opening, and make way toward the center of my vision which they then disappear. i get the sense these are not something outside in the atmoshere, exterior to my person but something 'on' (like i said..the sclera??)/ or, 'a part of' my body. i read the one explanation that it is 'white blood cells' with red blood cells collecting, which takes on the appearance of wagging tails. i dont believe that entirely....because, under a microscope these LOOK just like spermoza.....and egg-shaped 'head' which is illuminated and a thin, black short tail, attached to the rear of the 'head'...the tail (if i can remember) doesnt spiral but wiggle back and forth (like a tadpole in water) which then propels it 'forward'....blood cells do not act this way....not in the least. i am trying to remember now other factors which are present during these rare sightings....hmmmm, i think my mood & health are in good form, but a regular state of being....not happy, not sad....no extraordinary mood or life events.
Now, other folks here have reported seeing 'other things'....and there seems to be a collective commonality to these sightings outside, in nature, while viewing a panoramic scene (like the horizon, mountains, seascape, desert or fields....). I have never seen any objects in the sky (other than those nasty white planes dumping chemicals in the air, LOL...oh, wait a minute there was a rather unusual 'sky' event... winter 2015, upstate eastern NY, watching a sunny-lit 'plane' that suddenly disappeared from view, then left a strange, zig-zag type 'rainbow' of bright red, blue, green in clouds??? strange.) otherwise, no.