Thank you, do you also try deep and slow belly breathing? Just breathing downward so the diaphragm expands on the inhale and pulling the stomach back in slightly on a longer exhale. That puts me to sleep, and works well when I'm having minor PTSD episodes so I'll confirm that it works well.

What do you mainly use your breathing exercises for? Fitness, meditation, chi kung, NEW? (Calming down before a study session)?