Sleep hygiene / sleep schedule / sleep ritual.

I think you need to implement these.

It took me on average 2hrs to fall asleep (my normal) and I also naturally / normally sleep on average for 4-5 hrs per night.

Now ordinarily, sleep was really a non - issue for me, but I realised that I needed to sleep between midnight and 2am in order to get my best sleep. Problem was falling asleep on time, and what helped me was employing these sneaky sleepy tricks.

Now it takes me about 45min to fall asleep

I have a sleep ritual, it took a few weeks to click in my brain, but now when I do X Y Z, my brain equates it with sleep, and will mostly shutdown for the night about an hour later.

Ps. Melatonin is a hormone supplement, available OTC. I use it sometimes when things are rough.