Very Interesting! I have experienced this personally, a shift From Sympathetic, Shift into a Parasympathetic state. This was for me Playing a Kalimba Instrument as the Vibrations from this instrument are extremely relaxing, with in Minutes. I have tried this for weeks, testing this in felt response and, I have a CPAP, that has Diagnostics on it, that tells me my length of sleep Increased, my depth of sleep increased, my length of deep sleep increased. I believe that there are certain types of Instrument's that relax the body more than others. in my research there are certain musical instruments dating back 1000's of years (6000-BC in China and India) in many cultures that were used for health and Royalty.
Very Interesting! I have experienced this personally, a shift From Sympathetic, Shift into a Parasympathetic state. This was for me Playing a Kalimba Instrument as the Vibrations from this instrument are extremely relaxing, with in Minutes. I have tried this for weeks, testing this in felt response and, I have a CPAP, that has Diagnostics on it, that tells me my length of sleep Increased, my depth of sleep increased, my length of deep sleep increased. I believe that there are certain types of Instrument's that relax the body more than others. in my research there are certain musical instruments dating back 1000's of years (6000-BC in China and India) in many cultures that were used for health and Royalty.