One year, we decided to pass the new year eve in an uncle's house at some god forsaken hole with our dog. After a neverending trip during wich our dog farted in the car, we finally arrive. The said uncle was a radical ecologist, wich is not a problem per se, except when his only conversation subject is about the ecological collapse, not the ideal subject for a good atmosphere, with in addition to that my sister's BF, who was with us, doing his Mr. know-it-all show. Then we went to sleep, and i realize that i forgot my earplugs. No luck, everyone in my family was snoring very loudly, including the dog. Result: i didn't sleep at all and looked pretty much like a zombie the next morning.
I don't really have strong memories of Christmas, I get the impression from my family that I tended to be less depressive at that time of year.
CW: suicide
Well, aside from that time I snuck off from a party and tried to kill myself in the woods, but I was doing that a lot that year so I'm not sure that counts as a Christmas specific thing.