In understand this is a luxury not everyone can afford but what I do now is work from about 6-9am, go out during the day until about 3, work 4-6. Which if you add it up is still a solid 5 hour day.
For whatever reason it just makes me more productive and sleep better at night.
Before I did this I just felt like a slave to my computer, super tired all the time, depressed and lethargic. I had sleeping problems because I felt like I was missing out on “life” and for some reason I’d stay up late on Instagram, YouTube etc, maybe watching others live vicariously ? I felt dissatisfied.
Knowledge work pays well but IMO it can come at a pretty high cost if you don’t prioritise your life.
Edit: I read your reply on another post, I think you’re doing way too much at your job. It’s not manageable and it sounds like you’re burned out and likely failing at at least one of your duties making you feel down.