Being a dyed in the wool "looker out of the window" kind of guy, I was a bit confused on my last 787 Transatlantic.
Over Greenland, my window kept dimming.
Seemed like every time I looked away this happened.
I turned up the brightness so to speak and within a couple of minutes a hand appeared from the seat behind and dimmed it again.
Apparently the Didums behind wanted to sleep and the light was puting him off.
I contested him and he got really nasty.
Amongst other things, he claimed part ownership of the said window.
I did something I never do, as I hate it being done to me, I whacked my seat to the max recline and took 100% of ownership !
In fairness, as soon as we were over water, I dimmed it again for Didums :-)