Delayed sleep phase is often comorbid with ADHD. I have to take sleeping medication because my body wants to be up until about 4am and sleep until about 1pm. Which isn't sustainable with our modern way of life.

If you can, I 100% recommend seeing a professional. It took until I was 36 to figure out what all my deal is, but it was so worth it.

Good luck on your path either way! There are answers. Sometimes it's a huge, horrible slog to get them, but they're there.