This is not the best version of this I've ever seen. It's close but its missing a few key steps.
<a href="https://www.artofmanliness.com/articles/fall-asleep-fast/" rel="nofollow">https://www.artofmanliness.com/articles/fall-asleep-fast/</a>
I've used this on myself and my kids and it's worked well. There are some extra steps that I think round out the effect. If you've tried similar techniques, but without some of these steps, it might be worth it to add them.
1. Get physically comfortable, usually layout on your back with your arms at your sides, if possible.
2. Relax each part of your body starting with the top of your head and ending with your toes. This should take a good 10min. I guarantee you are clenching your jaw, making a fist, keeping your shoulders up, etc. You need to make each part of your body completely limp dead weight. You should be able to physically feel the unsupported weight of your body parts. I imagine that I am turning into solid lead and sinking into the earth (bed).
3. Focus on your breathing. I don't have any super techniques for how to breath, other than to focus solely on it. Count your breaths and start counting over again as soon as you think of anything else other than your breath. This will take a long time if your mind is wandering. Just start over as soon as you realize you are thinking of anything except counting your breaths. Once you get to 10 move on.
4. This is the end. Imagine yourself floating. You can be floating on a canoe, in a bath tub, on the ocean, in a cloud, it doesn't really matter. Just imagine that you are no longer laying in a bed in a dark room. I call this going to my happy place. Like with the breathing, as soon as you realize you are thinking about anything at all, stop and bring your attention back to the sensation of floating. If I've gotten this far then I will begin counting breaths again, too. But usually I don't make it this far.