I can relate to an extent as most of my stress comes from people those people are sleeping at this hour, but at the same time, nighttime also makes me saddest as it is also the time when most of my friends are sleeping. I notice how little to no personality I have and how much I rely on them for emotional stability when they are not around; I start going down of spiral of self-hate and depression. It's also the time to think of how much of a piece of shit I am. I have no personality of my own, so my friends tend to be my personality, and when I meet new people, I introduce them to my friends. When they start getting close, I get incredibly jealous as I feel like my friends are being taken away from me, and I start acting like a child and annoying.
I try not to think of these things as they cause a lot of anxiety, but when I'm alone, it's the first thing I think about.
So nighttime, for me, is a double-edged sword of sorts.