Fall asleep fast.
The fastest way to fall asleep is to stop trying. That's it — that's the method. Sleep doesn't answer effort; it answers a brain with nothing left to do. Give it one steady thing to follow and let the sound carry the evening the rest of the way.
You already know the mechanism, even if you've never named it. The nights you drifted off in front of the television — one constant low sound, nothing to track. Your attention settles on it, and settling is the whole trick. Rain does the job. Slow beats under the rain do it better: a rhythm that eases your brain down through the gears instead of letting it spin.
Set the room up once, then stop managing it. Dark and cool. The same time every night, give or take. Your phone charging anywhere but your hand. Then press play, close your eyes, and let the sound take over.
If your mind keeps running, don't argue with it. Give it the sound to run on. A thought about tomorrow is easier to drop when there's something steady underneath it — most people are asleep before they notice it working, which is exactly the point.
Rain and slow beats are waiting above, one tap away. Sleep well.