I used to have a terrible time falling asleep. At some point I stumbled on the technique of just "breathing like I'm sleeping" or just acting asleep based on m

I used to have a terrible time falling asleep. At some point I stumbled on the technique of just "breathing like I'm sleeping" or just acting asleep based on memories of the ultra-relaxed state I was in just after waking. Probably some combination of the relaxed breathing and mental focus on breathing make it work. The real beauty of it is that now years later I can fall asleep anywhere in 3-5 minutes if I'm even slightly tired even without having to consciously think about this technique anymore.