I was in bed last night, thinking how much my nighttime routine has gotten so predictable and boring these past few years. I was in no way depressed or anxious, but I felt a certain nostalgia for the "good old days."
Nowadays I go to bed at 9 p.m. but don't necessarily fall asleep right away. I used to stay up as late as 11:00 watching my favorite TV shows. So many of them ended a long time ago, or I simply lost interest in them (CSI, Supergirl, Once Upon a Time, American Horror Story, et al).
Going back further, I would even stay up as late as 1 a.m. in chatrooms, or playing The Sims or some online game. It didn't bother me much that I had to get up early for work the next day because I was having fun.
Most of the time, I scroll mindlessly through TikTok or Facebook with the TV on in the background, usually half-watching Law & Order SVU reruns.

I still have a few favorite shows or series on Netflix and Paramount+, but those are seasonal and I can watch them any day of the week at no specific timeslot.
Looking back, I certainly had more energy and enthusiasm in my 20s and 30s, even if it meant not having a good sleep hygiene.
ETA: For context, I'm single, turned 50 last year, and don't really go out at night.