I have the same issue. This is why I feel like this for most of the day.

Literally me everyday

Same. How does one fix this? I’ve had this issue for years.

Not enough sleep? Tired.
Too much sleep? You guessed it, still tired
Just the right amo–yeah that doesn’t happen lol

Half of the day, it’s melatonin time, the other half of the day, it’s caffeine time

You might have undiagnosed ADHD, I’m serious.

If you can, get that checked out (which can be really hard for adults, depends a lot on where you live).

I’d talk to a psychologist, not bring it up immediately but mention all symptoms messing with my day to day life.