About 8 years ago, I started switching up my work schedule a bit, where I'd take a half day on Wednesday. Just that little change made a big difference in my mood. Monday could still be a bit stressful, but it managed to blend the pessimism of Monday with the optimism of Thursday. Tuesday felt kind of like a Friday. Wednesday felt like euphoria. And then Thursday/Friday felt about like they normally do. Then, for a couple years, I started taking Wednesdays off completely.
Back then, I only worked about 2.5 miles from my house, so rush hour congestion really didn't affect me much. But then after I moved in 2018, now about 18 miles out, it was more noticeable. I started staggering my work hours where I'd stay late Mon/Tues/Thurs and leave around noon on Weds/Fri. Some people might take exception to even bother going in for 4-5 hours a day, but I found I liked having two short days more than having one whole day off.
Once Covid hit, and we started working from home, suddenly it didn't seem like it mattered anymore, and I feel like I'm stuck in a bit of a limbo, between working and retired. Monday doesn't bother me much at all anymore, and Sunday doesn't have that Monday dread hanging over it anymore. And sometimes, during the work week, I will lose track of what day of the week it is. It's not like being fully retired (or summer vacation as a kid) where the weekdays and weekend days all blur together. And I still take short days/days off here and there, and switch them up. As long as we have coverage at work, they're fine with it.
One one hand, I don't look forward to the weekend as much, but on the other, I don't dread the work week as much as I used to!
My housemate has been working a Tues-Sat shift since something like 2001. So for him, Saturday feels like Friday evening. Sunday feels like a Saturday, and he gets his "Sunday blahs" on Monday. Although, one advantage to a schedule like that, is when you're running around on Monday, vs Saturday or Sunday, you can get more done because most people are at work.