Muse S Athena validation studies

Assessing the performance of a portable electroencephalographic sleep monitor against level 1 polysomnography

Lanthier et al., 2026 · Sleep Advances

The most recent and most rigorous published validation of the Muse-S headband against gold-standard level 1 PSG. Cohen's kappa of 0.76 is substantially HIGHER than the best wrist-worn device in the Schyvens 2025 multi-device comparison (Apple Watch Series 8 at kappa 0.53). This is the strongest published evidence to date that EEG-based consumer headbands meaningfully outperform PPG/accelerometry-based wrist devices for sleep stage classification — which makes editorial sense, given that the Muse-S actually measures brain activity rather than inferring it. The study tested the standard Muse-S; whether the figures generalize to the newer Muse-S Athena variant requires verification against the full paper.