Life stuff

It’s easier to hold to your principles 100% of the time than it is to hold to them 98% of the time -Clayton M. Christensen

Try to quit (or drastically reduce) your caffeine intake. You’ll sleep better, and get sick less.
Have non-computer hobbies - you’ll need the balance.
Actively seek out better workplaces and working conditions. Strive to work at the best.
Memento mori - don’t waste your life on stupid shit.

Coffee

If coffee is sour, it’s under-extracted.

Buy black-out curtains for your bedroom windows, and keep electronic lights to a bare minimum
Only use your bedroom for rest. Don’t eat/watch TV/etc. in there
Caffeine can stay in your system for 12 hours (give or take a few hours). Determine when you want to fall asleep, and then set your last-cup limit accordingly (eg if you go to bed at 9PM, no coffee after 9AM)
Avoid books/stimulating literature (eg stick to light fiction instead of riveting political manifestos) in bedroom
Stop checking phone before bed - set a “light’s out” for screens an hour or two before bedtime
No alcohol after dinner, since alcohol is bad for sleep
Exercise regularly, but avoid anything strenuous 3-4 hours before bedtime
Get out of bed if you can’t sleep, don’t ruminate about the inability to sleep.
If you can manage it, take an early afternoon siesta (<30m)
Have a consistent wind-down routine that’s fairly mindless, like completing next day’s prep before bed
Consider nasal saline spray if you live in a dry climate
Take any pain medication (eg acetominephan) 30m before bed so there’s time to for it to kick in before sleeping
Don’t cheap out on your mattress - you’ll get bad sleep and a bad back as well
Weighted blankets are good for some folks (not all), try one if you haven’t yet
If your sleep still sucks, talk with your doctor. Insomnia research still has new techniques emerging