One trick that makes me sleepy really fast: After I close my eyes, I imagine someone throwing black paint on them. The first coat is kinda gray and has lots of blob and not fully black. Then another coat. And another. Each one gets darker until it's just pure black and I'm usually asleep by then.
For some reason, my brain follows it, and I fall asleep much faster. It works way better for me than box breathing or most other sleep tricks I've seen. Sharing in case someone else finds this useful.
Similarly, I never try to imagine a bright sunshine. It can wake me up
Love this. I'll try it.
Ive found great success with the Military Sleep Method where you progressively shutdown your body from head to toe.
If noise keeps you awake (loud neighborhood) then a white noise blanket could work. I downloaded a 10 hour beachwaves sound and played it to cover the noise. Two small speakers left and right made it feel like I was there with the stereo. It took a little bit to get used to, but it did the trick.