Marcy and Jack follow forty-four pilots through a month of five-minute coherence practice — and find stress falling without sedation, plus the morning practice. Read the paper: Practice effects of a breathing technique on pilots' cognitive and stress associated heart rate variability during flight operations (Jingyi Zhang, Wen-Chin Li, Graham Braithwaite, James Blundell, 2024, Stress) — https://doi.org/10.1080/10253890.2024.2361253