Here’s what regular humming can do to your body… Researchers tracked people’s heart rate variability — one of the best ways to measure your stress and recovery levels. And they compared four activities: – Humming – Physical activity – Emotional stress – Sleep And guess what? Humming beat them all. Participants who hummed had the best heart rate patterns, the lowest stress index, and the strongest signs of nervous system recovery. When you hum, you activate your parasympathetic nervous system — t