Yep - there's SAD and there's the opposite - where too much light and sun and long days will not allow quality sleep / drive you nuts. I tend to get both, exacerbated in areas where there's a big disparity between winter and summer day lengths.
Yes, I find that both the shortest and longest day times of year are challenging for me. Mostly the short days in the winter, but sometimes very long days can also feel like too much ("I want to go to sleep! Why is it still so bright!").
I had a big a-ha a few years ago when I realized that my current job hours and location result in me missing any sort of halfway decent morning light for a good chunk of the year (I start work at 7AM, my office is on the west side of a high rise building surrounded by much taller high rise buildings). Some changes that helped were:
1) switching my morning commute so I was coming in by bus (above ground) rather than train (mostly underground) and also buying a daylight lamp for my desk, which I use for 10-15 min each AM.
2) Installing some different lighting in our apartment. My husband put in some overhead lights that are very bright, which is good for winter days that seem too dim, but I also found that using a smaller and softer light in the early morning felt "cozier" and that having that on for a bit helped my morning routine feel more like a special time for myself.
3) Getting some time outdoors every day. Easier said than done when working. Movement also definitely helps to warm me up and be less bothered by the cold.
4) Trying to continue to eat a healthy diet--when I'm feeling down stuff like a big plate of cheese on toast for dinner sounds like a great idea, but I feel like it ultimately makes me feel worse the next day.
Longer-term, I am hoping that FIRE will allow me to deal with winter in a better manner. I do think that working a FT job in an office with mediocre lighting is the big reason I get winter blues, and that all the stuff I do to combat it would either be easier to do or just not necessary if I weren't in this particular job/office set up (hmmm, maybe I really do need to find a new job...). I don't recall being anywhere near as sensitive to the winter blues during times in my life when I had more freedom to control my schedule. i.e. when I was in university/grad school, it was easier to get outside during the day, or to sleep in or finish up with work early and then have some time to spend doing something fun or relaxing (either outdoors or something indoors like reading, meeting up with friends, working on craft projects). And when I was a child/teenager, school would be done by mid-afternoon (plus you always had 2-3 weeks completely off in December/January!) so it was also easier to get outside.