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I was too absorbed thinking about it, and the passenger beside was snoring in deep sleep. Couldn't even get to the toilet!

I find this a very interesting observation.
I wish I could give you some explanation, but without some visual evidence or more data it would be pure speculation on my part.
Speculating could be treated from some atmospheric phenomenon (ice crystals in the upper layers of the atmosphere) or a UFO or simply an illusion within the early stages of sleep. Or any other thing...

Yeah it's a shame. But I was pretty sober and certain as I was looking at it for a good 10 minutes!

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