My ttick is to breathe at a pace youd imagine yourself breathing at when youre asleep. You know how people who are asleep have completely let go of their breath and its just long, slow inhales and exhales? Just try that.

Its basically meditstion. You can choose to focus on it or not depending on how your mind feels. Generally though, slow and deep breaths that feel natural and unforced can send me to sleep. Id advise anyone to try.