The following incident took place on 25th July. I described it on Facebook where it elicited quite a few kind comments, concerned that this might mean I was having a stroke, or a detached retina, or some other variety of disaster. They urged me to get to A&E asap. All of which was perfectly plausible and sensible but instead I went to Google and found an explanation which fitted my experience precisely. I had witnessed an Entoptic Phenomenon and fascinating it was too. I have had similar visual experiences before but never as startling as this one.
Couldn't sleep last night, drank coffee after
dinner, foolish. Stayed up writing until 3 or 4 am then went to bed.
Pulled the sheet over my head to hide from daylight, closed my eyes,
couldn't sleep. Opened my eyes. OMG what am I looking at?
black and white pattern, like and unlike flowers or insects, slowly
moving, pulsating, not going anywhere but contained, like something
observed under a microscope, thin fronds around the edges gently
swaying. I'm looking at this with my
eyes open, not asleep, lying on my right side, right cheek pressed
against the pillow (thin pillow, better for the back) left hand under
the sheet. I move the hand to see if the 'vision' will disappear. It
doesn't. But what the hell is it? Sort of beautiful but also scary. Why
is it moving? An optical illusion, a trick of the light? I bring my hand
closer and now the hand metamorphoses, turns into a pulsating pattern
of dark and light layers, the solidity of the hand is gone, as if it was
never there, but the moving, floating layers of plasma remain.
astounded, I raise my head up and
look around the room - full daylight, everything normal. After a
while I manage to get a few hours sleep. When I wake up, I put my head
under the sheet to see if the phenomenon is still there but
more like a reconstruction of light effects.
Here's a Youtube video explaining the phenomenon scientifically in great detail which is probably more than we want to know but interesting nonetheless.