My doctor said "you have to earn your sleep". I had the same problem until:

- two pieces of fruit per day

- two portions of vegetables per day

- half an hour of outside sunshine per day

- twice per week exercise until you sweat

- no sleep during the day

- get out of bed every morning around the same time

- no processed food!

I was in the same boat as you and it seems I solved it.

What I did :

- LSD (microdosing + a semi dose one year ago) did absolute wonders on my anxiety (which was what kept me energetic). I would then describe myself as having a general anxiety disorder and I now describe myself as chill af. It's amazing. I'm still stressed out by things but that's normal and not my default mode anymore.

- Prolonged-release melatonin keeps me asleep for the whole night

- Took the habit of reading in the bed. I'm so tired that most evenings, I have a really hard time to read 5-10 pages, I must fight to keep my eyes open.

I do that, it seems like a self-reinforcing pattern I end up in after messing up my sleep schedule. I take a sleep aid (like Zzzquil) for a bit to get back on schedule. Caffine before 1pm or so helps too.

This is a shifted circadian rhythm. If you get up late, you'll be sleepy late; additionally, blue-light exposure at night (from screens) suppresses melatonin production and can delay onset. The fix isn't to "go to bed early" first, it's to get up early and get exposure to sunlight then and during the day, and the sleep pressure in the evening will follow in kind. This is further facilitated by giving yourself time in the evening to wind-down away from screens, by having a ritual/routine (an hour at least) such as preparing breakfast, reading, doing yoga, whatever.

Think of it like jet lag. If you travel to the other side of the world, you rapidly shift schedule in accordance with your habits (the timing of your meals, light exposure, activity, socializing etc), whether that be night or day. These inputs more than ever influence morning-ness or evening-ness qua chronotype, with the advent of limitless evening light and entertainment.