Stage check
Did you sleep deeply?
Measure recovery. Build resilience. Show up sharper.
Sensors measure your sleep stages, intensity, positions, and patterns, so you get the most out of your time at rest.
Continuity check
Was your sleep continuous?
Fragmentation screens reveal hidden disruptions.
Position check
Did your position support your rest?
Motion sensing correlates sleep quality with body position.
Free with Athena
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Sleep Assist
EEG-guided audio that adapts at lights-out and
during 2 a.m. wake-ups. No phone, no scrolling.
Free with Athena
Deep Sleep Boost
You can hit “enough” deep sleep and still wake up foggy.
What separates a good night from a mediocre one is continuity.
Deep sleep is when your body does its repair work, and it works
best in unbroken runs.
Deep Sleep Boost listens for those runs and reinforces them with
whisper-quiet pink noise, timed to your brain's own slow
waves.
Wear Muse S Athena to bed
~24% longer slow-wave runs2
Meaning users stayed in continuous deep sleep rhythms for longer stretches
Enable Deep Sleep Boost in the Muse app
~42% more slow-wave runs per minute2
Indicating more frequent opportunities for sustained deep sleep
Athena handles detection and timing automatically
~76% more slow waves inside organized runs2
Reflecting deeper, less fragmented slow-wave activity
Track your metrics when Deep Sleep Boost is activated during the night
Slow-wave trains2
These trains represent sustained periods where the brain remains in a stable slow-wave state
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Smart Wakeup
Most morning grogginess comes from being pulled out of deep sleep. A 7:00 alarm catches light sleep on Monday and deep sleep on Friday.
Set a wake window. Muse finds the lighter sleep inside it and wakes you there for clearer mornings.
Premium · Athena only
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Dream Recall
Dreams fade fast once you're out of them. Dream
Recall finds REM and wakes you inside one, then
Auto-Snooze eases the sound back so you can slip
straight back in.
Other trackers infer
A ring or a watch reads your pulse and your movement, then estimates which stage of sleep you were in. It never measures the organ that makes sleep.
Muse measures the source
EEG sensors sit on your forehead and record the same signal a clinical sleep lab records. No estimating, no proxy.
88-96%, stage-by-stage agreement with polysomnography, the gold standard in sleep measurement.3
Frequently asked questions
- 4 Muse S. Lanthier M, Foti MC, Fonseca K, Higginson C, Oksit D, Smith D, Lina JM, Tavakoli P, Fogel S, Ray L, Robillard R, Canadian Sleep Research Consortium. "Assessing the performance of a portable electroencephalographic sleep monitor against level 1 polysomnography." SLEEP Advances 7(1), 2026. 47 participants analysed of 56 enrolled. Funded by an Emerging Research Innovators in Mental Health award; InteraXon provided devices in kind and did not fund the study. Per-stage accuracy 87.7 to 96.4%; overall kappa 0.76.
- Oura Ring Gen 3, Apple Watch Series 8, Fitbit Sense 2. Robbins R, Weaver MD, Sullivan JP, Quan SF, Gilmore K, Shaw S, Benz A, Qadri S, Barger LK, Czeisler CA, Duffy JF. "Accuracy of Three Commercial Wearable Devices for Sleep Tracking in Healthy Adults." Sensors 24(20), 2024. 35 participants aged 20 to 50, Brigham and Women's Hospital, polysomnography scored to AASM guidelines. Funded by Oura Ring Inc., Harvard Catalyst, NIH award UL1 TR002541, Brigham and Women's Hospital and Harvard University; the first author sits on Oura's Medical Advisory Board and consults for Oura. Four-stage agreement 76.3%, 75.0% and 70.9% respectively.
- Somfit, WHOOP 3.0, Polar Vantage V, Garmin Forerunner 245. Miller DJ, Sargent C, Roach GD. "A Validation of Six Wearable Devices for Estimating Sleep, Heart Rate and Heart Rate Variability in Healthy Adults." Sensors 22(16), 2022. 53 participants, six devices tested in one study. No device-manufacturer funding declared. Multi-stage agreement 65%, 60%, 51% and 50% respectively. Human inter-scorer figure of kappa 0.78 as reported in that paper; the 2024 paper above cites roughly 80% agreement between two independent scorers.
- What this comparison is and is not. These are separate studies rather than one head-to-head trial, so samples, sites, device generations and nights differ. All bars are Cohen's kappa for multi-stage sleep classification against polysomnography. Kappa is used rather than accuracy percentages because percentage figures are computed differently between papers and are not directly comparable: Muse's 88 to 96% is per-stage accuracy across four stages, while the competitor percentages above are overall four-stage agreement. A separate 79% figure that Oura publishes comes from a 2021 paper authored by its own scientists using a research version of the ring, and is not the figure from the 2024 hospital study. Muse is not a medical device and is not intended to diagnose, treat, cure, monitor, or prevent any medical condition or illness.
