Review · 6 min read

Dreem 3S (Beacon Biosignals): Sleep Tracking Data and Specifications

Dreem 3S review built from Beacon Biosignals' published product information. FDA 510(k) K223539 cleared dry-EEG sleep headband. Not sold to consumers; clinical research only.

Summary of Findings · 2023

Evidence summary: Dreem 3S (Beacon Biosignals)

1 outcome has measured evidence in the CircaTest corpus, drawn from 1 peer-reviewed study totaling 25 participants. Each card below answers one buyer question and shows the most representative finding. Hover any certainty badge for the verbatim GRADE definition. The full per-study breakdown is in the Sources panel below.

Outcome 01 of 01

Very low

Sleep stage classification

How well does the device tell deep, light, REM, and wake apart?

Agreement

—

Best evidence

Not reported

From Wood et al., 2023 (n = 25)

The published abstract describes the methodology and the Bayesian framework but does not state per-device epoch agreement values that CircaTest can extract without the full paper. Consult the JSR full text for the per-stage and per-device numbers.

Each card answers one buyer question. The bold AGREEMENT label maps the underlying statistic to a normalized rubric (Landis & Koch 1977 cutoffs for kappa, standard percent thresholds for accuracy and per-stage agreement) so cards from different devices can be compared at a glance. The GRADE certainty rating is computed across all contributing studies for that outcome, not just the representative one shown. Methodology →

Audit · sources & method1 study · 25 participants · 2026-04-06

Every quantitative claim above traces back to one of the studies listed here. Click any study identifier to verify against the primary source. CircaTest does not own or modify any of these studies; we link out so you can audit the original.

  1. Re-evaluating two popular EEG-based mobile sleep-monitoring devices for home use

    Wood E et al. · Journal of Sleep Research · 2023

    n = 25 · healthy · vs other reference

    PMID 36696908DOI 10.1111/jsr.13824

    Tested in this study as: DREEM 3 headband

    Reported metrics for Dreem 3S (Beacon Biosignals):
    • Epoch-by-epoch agreement: see sourceThe published abstract describes the methodology and the Bayesian framework but does not state per-device epoch agreement values that CircaTest can extract without the full paper. Consult the JSR full text for the per-stage and per-device numbers.

    CircaTest note: Independent re-evaluation (not vendor-funded) of the Dreem 3 headband alongside the Zmachine Insight+. Important because most prior Dreem validation work was authored or co-authored by Dreem (the company). Wood et al. give an outside-the-vendor perspective. CircaTest cites this as the independent counterweight to the developer-published Dreem validations.

    Full study record on CircaTest →

Sources retrieved from PubMed, Europe PMC, and publisher pages. Abstracts shown on individual study records are reproduced under public-domain or fair-use license per their source. Identifiers above link to the original primary source. CircaTest is the curatorial layer; we do not modify the underlying studies.

Data Sources and Methodology

This review compiles data from Beacon Biosignals' published Dreem 3S product information at beacon.bio (verified April 6, 2026) and the FDA 510(k) database. No first-person testing was conducted and the device is not available for consumer purchase, so no aggregated user reviews were used.

Important caveat upfront: the Dreem headband family has been evaluated in several peer-reviewed studies. The most relevant independent work in the CircaTest corpus is Wood et al., 2023, a vendor-independent re-evaluation of the Dreem 3 and Zmachine Insight+ using a Bayesian framework against developer-published PSG comparisons. That study does not publish per-device numeric agreement figures in its abstract, so verify each accuracy claim against the full paper before relying on it. Prior Dreem-company-authored validation work is also available in the literature but is not yet imported into the CircaTest corpus.

Availability

The Dreem 3S is FDA-cleared (510(k) K223539) and is the current Beacon Biosignals product, but it is not available for direct consumer purchase. Beacon Biosignals discontinued direct consumer sales of Dreem in March 2021 when Dreem (the company) was acquired. The device is now sold only to clinical research customers, healthcare providers, and pharmaceutical sponsors. It is marketed as the “Waveband” in some Beacon Biosignals contexts.

Pricing is set per clinical research engagement and is not publicly listed. CircaTest does not have a verified consumer purchase price and does not maintain affiliate links to clinical-research products.

FDA Status

Beacon Biosignals received FDA 510(k) K223539 clearance for the Dreem 3S. In December 2024 the FDA additionally authorized a Predetermined Change Control Plan (PCCP) for the Dreem 3S, allowing continuous algorithm enhancements without requiring re-clearance for each update. CircaTest has not separately extracted specific accuracy figures from the FDA submission. Verify the clearance scope against the FDA 510(k) database before relying on it.

Sensor Suite

Per Beacon Biosignals' published documentation, the Dreem 3S contains:

  • Dry EEG sensors. The Dreem headband measures actual brain electrical activity, not PPG-derived sleep stage estimation. This is the key reason the Dreem family has historically out-performed wrist-worn devices on sleep stage agreement with PSG.
  • Accelerometer.

The Dreem 3S does not include PPG, SpO2, ECG, EDA, temperature, altimeter, or GPS sensors. It is purpose-built around continuous in-home EEG with sleep staging algorithms.

Sleep Tracking Features

According to Beacon Biosignals' product information, the Dreem 3S detects light sleep, deep sleep, REM sleep, and naps and produces a sleep score. There is no smart alarm feature documented for the 3S model. CircaTest has not separately extracted total-sleep-time deviation figures for this generation.

Hardware

  • Weight: specific weight not extracted from a verified manufacturer source.
  • Battery: specific battery life not extracted from a verified source for the 3S model.
  • Water resistance: not designed for water use.
  • Material: soft fabric headband.
  • Display: none.

Compatibility

The Dreem 3S is provisioned through Beacon Biosignals' clinical platform rather than a consumer iOS or Android app. CircaTest does not list iOS, Android, Apple Health, Google Fit, or Strava integrations for this device.

Who It Is For (Based on the Data)

  • Clinical research teams running in-home sleep studies who need actual EEG rather than PPG-derived staging
  • Pharmaceutical sponsors using EEG-derived endpoints in trials
  • Healthcare providers contracting with Beacon Biosignals for sleep monitoring services

The device's data profile is not aligned with general consumers. There is no consumer purchase path. Consumers looking for an EEG-based sleep tracker should look at the Muse S Athena instead, with the understanding that Athena uses a different EEG configuration and has its own data gaps.

Products Mentioned

Dreem 3S (Beacon Biosignals Waveband)

Dry-EEG sleep headband. FDA 510(k) K223539 cleared. Not available for consumer purchase. Sold only to clinical research customers, healthcare providers, and pharmaceutical sponsors via Beacon Biosignals. CircaTest does not maintain an affiliate link to this product because it is not sold to consumers directly.

Not medical advice. This article is for informational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. FDA 510(k) clearance is not the same as a clinical diagnosis. If you have health concerns, consult a qualified healthcare provider.