The thing I've found works to calm me down when I'm trying to sleep is to take a series of deep breaths. Long and slow in and out, but not awkwardly so. Usually

The thing I've found works to calm me down when I'm trying to sleep is to take a series of deep breaths. Long and slow in and out, but not awkwardly so. Usually on about the 5th breath the nature of it changes quite a bit and I can feel the tension drain out of me. From there, falling asleep is usually not far off.