Many slow-breathing studies show that reducing breathing speed can increase vagally mediated heart rate variability, which is associated with parasympathetic activation and relaxation.
From that starting point, this soundscape was built around two core elements:
Undulating Vagus Hum: Built from a deep grounding rumble, warm low drone, soft theta pulses, and gentle brown noise, this blend helps calm the vagus nerve and guide the body toward deep sleep.
Resonant Vagal Drone: Built from a steady low-mid hum with minimal movement and a centered tone, this sound promotes nervous system safety, supporting vagal calm and easier sleep onset.