The Modius technology delivers small, safe electrical pulses to the skin behind the ear, stimulating the vestibular nerve to activate deep brain structures that regulate sleep, circadian rhythm, arousal, and stress response. This approach is known as electrical Vestibular System Stimulation (VSS).

Located in the inner ear, the vestibular system has direct projections to the hypothalamus, brainstem, and associated regulatory structures, making it one of the few sensory pathways with non-surgical access to these regions. The brainstem functions as a regulatory hub for a range of physiological processes. Chronic conditions including insomnia, anxiety, and PTSD dysregulate these signals. The goal of VSS is to restore normal physiology.

The Modius headset delivers stimulation through two small disposable electrodes placed bilaterally over the mastoid processes. The three Modius treatments each use a unique waveform, with the stimulation paramaters being designed to activate specific parts of the brain known to influence sleep and stress response.