A military technique for falling asleep in two minutes
Usually when I suffer from an inability to sleep it's because my mind ends up focusing too hard on things that ground me to reality. Existential dread, worrying about work, thinking about technical problems etc.So often my technique to fall asleep has been to focus my mind on the fantastical. Stimulate my imagination a bit, like what if I was a dwarf in a fantasy universe. This tends to focus my thoughts inwards and naturally segues into sound sleeping. Letting my mind wander only becomes an issue when it's anchored to real life.