Muse S Athena: Sleep Tracking Data and Specifications

Data Sources and Methodology

This review compiles data from Muse's official Muse S Athena product page (choosemuse.com, verified April 6, 2026). No first-person testing was conducted. All sleep accuracy claims are evaluated against polysomnography (PSG) where peer-reviewed evidence exists.

Important caveat upfront: no peer-reviewed PSG validation specific to the Muse S Athena has been published as of April 2026. The standard Muse-S headband was validated against level 1 PSG in 47 adults by Lanthier et al., 2026Cited studyAssessing the performance of a portable electroencephalographic sleep monitor against level 1 polysomnographyLanthier M et al. · Sleep Advances · 2026The 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.View full record →, which reported Cohen's kappa of 0.76 (the highest in the CircaTest corpus, ahead of the best wrist-worn device in Schyvens et al., 2025Cited studyA performance validation of six commercial wrist-worn wearable sleep-tracking devices for sleep stage scoring compared to polysomnographySchyvens AM et al. · Sleep Advances · 2025Single most editorially important study in the CircaTest corpus. Six commercial wearables tested against PSG in a uniform protocol means the kappa values are directly comparable in a way most validation studies are not. Drives the head-to-head accuracy figures across CircaTest's comparison content. Limitations: tested previous-generation models (Series 8 not 10, Charge 5 not 6, original ScanWatch not 2) so the results are upper bounds for current models, not direct evidence.View full record →). Whether those figures generalize to the newer Athena variant (released 2024, EEG plus fNIRS) has not been established in peer-reviewed literature. Buyers should weigh that data gap before relying on the device for any clinical purpose.

Sensor Suite

Per Muse's product page for the S Athena, the device contains:

• 7 EEG sensors that detect and measure brain electrical activity. The sensor unit sits just above the eyebrows.
• fNIRS (functional near-infrared spectroscopy) sensor. Muse positions the Athena as the first commercial device to combine EEG with fNIRS for sleep tracking.
• Optical heart rate sensor with pulse oximetry (PPG plus SpO2).
• Accelerometer and gyroscope.

The Athena does not include a temperature sensor, ECG, EDA, altimeter, or GPS. The combination of actual EEG plus fNIRS is the headline differentiator from wrist-worn and ring-form trackers in this corpus.

Sleep Tracking Features

According to Muse's product documentation, the Athena uses delta brain wave activity for deep sleep detection and detects light sleep, deep sleep, REM sleep, and naps. The device produces a sleep score and exposes full staging data in the app without an additional subscription. There is no smart alarm feature documented for the Athena.

CircaTest cannot independently verify the per-stage accuracy claims for the Athena because no peer-reviewed PSG validation specific to this model has been published. Verify any specific accuracy claim against the full paper or Muse's published validation documentation before relying on it.

Health Features

• Heart rate variability (HRV): tracked via the optical heart rate sensor.
• Resting heart rate: tracked.
• Blood oxygen (SpO2): measured via the optical pulse oximetry sensor.
• Stress tracking: included; Muse's heritage is meditation feedback driven by EEG.
• Respiratory rate, body temperature, menstrual cycle, readiness, strain, recovery, sleep apnea detection: not included.

The Muse S Athena is marketed as a wellness device, not a medical diagnostic device. It is not FDA-cleared. Verify against the FDA database before relying on it for any clinical purpose.

Hardware

• Weight: specific weight not extracted from a verified Muse source for the Athena. The earlier Muse S Gen 2 was approximately 41 grams; the Athena weight is not separately documented in our verified sources.
• Battery: approximately 10 hours per full charge per Muse's product page. Charging time approximately 3 hours.
• Water resistance: none. The Athena is a soft fabric headband worn over the forehead and is not designed for water use.
• Material: soft fabric headband with integrated sensor pod.
• Display: none.

Subscription and Cost

The Muse S Athena is $474.99 USD per choosemuse.com. Muse offers an optional Premium subscription for additional content; the device functions without it, including full sleep staging.

Compatibility

The Muse S Athena pairs with both iOS and Android via the Muse app. Apple Health, Google Fit, and Strava integrations are not documented as supported.

Who It Is For (Based on the Data)

• Users who specifically want a forehead-EEG headband rather than a wrist or ring tracker
• Users interested in the novel EEG plus fNIRS combination, with the understanding that Athena-specific peer-reviewed validation does not yet exist
• Users who are comfortable wearing a fabric headband to bed
• Users who prefer a one-time purchase model with full sleep staging available without subscription

The device's data profile is less aligned with users who require independent peer-reviewed validation for the exact model they are buying, users who need an FDA-cleared sleep apnea diagnostic, or users who want a low-profile wearable for water activities.