Zircadia
Reusable in-ear ExG electrodes

Full EEG sleep staging, from the ear.

A reusable 4-lead system with gold-plated electrodes.
Soft and hear-through in three sizes.
Wet or dry.
In the lab or at home.
On the systems you already run.

Get in touch contact@zircadia.com
Zircadia reusable in-ear ExG electrodes in three sizes with touchproof leads
Specifications

Built to drop into the setup you have.

40+ OEM systems
In-lab, research and home systems with EEG capability.
4 leads
EEG, EOG, EMG and heartrate configurations. Standalone or expanded montages.
Wet or dry
Gold-plated contacts, gel if needed.
3 sizes
Fit-based sizing. Soft and hear-through. Easily cleanable, durable and reusable.
How it works

Three steps, from sizing to scoring.

Zircadia eartip seated in the ear
01
Sizing

Pick one of three sizes and insert it like an earbud. Hear-through, so the wearer can still hold a conversation. Wet or dry use supported.

Zircadia leads connected to a home sleep testing deviceZircadia leads connected to an in-lab PSG headbox
02
Connect and record

Standard touchproof leads into the amplifier you already own. Proven configurations and expert support. Full EEG, EOG, EMG, plus heartrate.

In-ear EEG channels from an overnight recordTwo scored hypnograms from one overnight record, in-ear compared with PSG
03
Review and score

Score in your own software with our configuration and scoring guide. Or send us the record if you want help.

Performance

Measured against simultaneous PSG.

>95%
Sleep/wake accuracy
>80%
Five-stage scoring accuracy
>80%
Arousal concordance
80%+
Of overnight data human-scorable

Across 41 nights under two IRB protocols. Strong spindles and delta; data and scoring guidance available on request.

Research support

We can help with more than the hardware.

We work alongside research teams from protocol design to data scoring.

Study planning

Channel selection, OEM devices, montages, protocols, and IRB support.

Setup and in-study support

Integration with your OEM system, training, fitting, and troubleshooting once recording is underway.

Data scoring

Assistance with filtering, sleep staging, scoring and data labeling.

Talk to us about your study
News

News and press.

Zircadia was previously known as EerDx.

Sep 2026 Zircadia Receives NIH Phase I SBIR Award from NHLBI to Advance In-Ear Sensor for Sleep DiagnosticsZircadia · Company announcement Sep 2026 Reusable In-Ear ExG Electrodes Aim to Simplify Sleep StagingSleep Review Jul 2026 Zircadia: how to measure sleep qualityREBIS Health Mar 2026 A new path to sleep dataSleepWorld Magazine, March/April issue Jun 2025 Ascent Deep Tech Community Showcase highlights CU's next breakthrough startupsVenture Partners at CU Boulder May 2025 Ascent Deep Tech Accelerator to showcase its 2025 cohortVenture Partners at CU Boulder
Who we work with

Research, clinical and funding partners.

University of Colorado Boulder ASCENT Deep Tech Accelerator Embark Deep Tech Startup Creator REBIS Health NIH SBIR

Be among the first to get ear EEG.

Tell us what you are recording and which system you run, and we will tell you whether we fit.

contact@zircadia.com

Available for research use only. Not FDA cleared for clinical use- please monitor for future news releases on clinical availability.