The theory is that you train the nervous system involuntarily when practicing it twice a day. > You change the tone of the autonomic nervous system. You decrease sympathetic tone, increase parasympathetic tone, the relaxation response. [2] Healthline is a great resource and the long conversation with Dr Weil and Tim Ferriss. [3][4] [2]: https://www.youtube.com/watch?v=yP9vY4NTRqE&t=3189s [3]: https://www.healthline.com/health/4-7-8-breathing [4]: https://play.pocketcasts.com/podcasts/046f9e00-a81a-0131-c656-723c91aeae46/d2a9a915-fe31-48de-b729-afe5cd90f473.

www.youtube.comwww.youtube.com4-7-8 Breathing: How It Works, How to Do It, and MoreThe 4-7-8 breathing method can aid in rest, reduce stress, and improve heart health. Consider this breathing technique if you face challenges with sleep or relaxation.www.healthline.com