For me, I find my sleep suffers because of what some describe as "revenge bedtime procrastination". When my job is shit (i.e. now), I'm more inclined to stay on the PC later doing things that bring me some level of joy, or play games to escape the mind spinning its wheels. I seem to more easily recognise that my job is unfulfilling because I'm staying up later or I'm dreading going to bed. Going to bed early for a go…
I say this as an always "late" person who now tries to get up at 5 to work out and reflect, it's been very helpful.