SOMNOwatch™ plus


  • A picture of the SOMNOwatch Plus wearable datalogger and strap.
    The SOMNOwatch Plus wearable datalogger.

Long recording times (up to 25 days!)

Research Grade Sensors

High sampling rates - Up to 256/32 Hz

Data Compression for long recording times

Up to 8 External Channels - BP, Resp, 6 x EEG, and more...

Double Plot & Raster View - for improved circadian analysis

Powerful Customisable Reporting.

Need simplicity? Then start with our standard report template and change the order if required. Or select the data you want in each table/graph and display it in the order you want. You can even add your own branding in the header.

Need more? Then use our custom report builder and make you own design with total freedom. The possibilities are nearly endless.

The SOMNOwatch™ plus is a powerful, miniaturised actigraphy and multi channel recorder which is as comfortable and user-friendly as a watch.

As any multi-channel system, the SOMNOwatch™ plus can replace several devices while providing excellent signal quality. Our SOMNOwatch™ plus actigraphy encases a digital triaxial accelerometer, ambient light sensor and event marker. Its small, easy to use and offers long recording times. Combined with additional modules, the SOMNOwatch ™ plus can also be used flexibly as a 1-channel long-term EEG, long-term ECG, respiratory screener or PLM recorder.

SOMNOwatch Plus Technical Highlights

  • High resolution
  • 7 Internal channels
  • High Signal-to-Noise ratio
  • 2 color LED for better communication
  • Piezo tone generator built in (programmable)
  • 64 MB Storage capacity
  • Long recording time (up to 25 days depending on sensors attached and sample rate)
  • Up to 8 external channels
  • Data Compression Mode

Tremor Analysis

The high frequency acquisition of movement data enables the SOMNOwatch™ plus to make a very accurate frequency analysis using FFT. The recording of tremor intensity and tremor frequency can be achieved over a long period of time. This parameter can be used for the medical diagnosis and treatment of Parkinson’s disease.

Analysis Software

  • Programmable, delayed auto start
  • Spectral Analysis to detect tremor
  • Easy determination of Frequency and Intensity in the Tremor Spectrum
  • Fast results output in a tabular or graphical format
  • Export to Microsoft EXCEL

PLM / RLS Recorder

Applied to the ankle, the SOMNOwatch™ plus can continuously record Leg Movement for up to 5 nights. It can differentiate between the standing and lying position by using the integrated position sensor. With adjustable parameters, the software automatically recognizes PLM movement patterns and evaluates the PLM index. For RLS-rating (Restless Leg Syndrome) the Motor activity is quantified.

For an extended diagnosis the correlation of PLMs and Cortical Micro Arousals can be detected by using the EEG Derivation (optional).

For the detection of PLM on both legs, an external movement sensor can be fixed to the second leg, and work simultaneously with the SOMNOwatch™ plus.

The SOMNOwatch™ plus is validated for the detection of periodic leg movements*.

*Benes H. at all, Validation of the new actigraphy system SOMNOwatch™ for the measurement of periodic leg movements, 2. Weltkongress der Schlafmedizin (WASM), Bangkok (Thailand), 2007.


Extra Sensors (1-channel)
  • Pressure Sensor Flow / Snore – respiratory analysis with nasal cannula
  • 1-channel EEG – Sleep Scoring: Wake, REM, 1,2,3,4
  • 1-channel ECG – Long Term ECG measurement
  • PLM / EMG sensor

Thanks to the correlation of the measurement results of the additional sensors with actigraphy and body position, further information for exact diagnosis can be provided (for example with ECG for cardiovascular diseases).

Combi-Sensor Flow/Snore with ECG

Combi-Sensor for simultaneous measurement of Flow/Snore with 1-channel ECG. Designed for a cohort study in Germany

EEG-Module - 6 Channel Head Box
  • 6 EEG + 1 EMG/ECG
  • Impendance check with colour coded lights
  • Continuous impedance recording
  • up to 50 hour recording duration
  • ECG elimination
  • Accoustic replay

RESP-Module - Respiratory Analysis
  • Flow (nasal cannula)
  • CPAP / BiPAP pressure
  • Effort (thorax and abdomen)
  • Snore
  • SpO2, pulse rate
  • In the SOW: body position, activity (sleep / wake), ambient light (TIB)

Automatic event detection, automatic detection of Cheyne-Stokes respiratory patterns, continuous determination of obstruction level.
Additional respiratory analysis by phase angle analysis – independent of respiratory flow.
Up to 80 hours recording time.

BP Module - Continuous Blood Pressure Measurement
  • Covers all Max and Min, never miss an event (real max and min)
  • Detection of BP fluctuations during night time *
  • Detection of BP base line shift during REM stage*
  • No patient disturbance during the day or night
  • Minimized deviation caused by Body position changes
  • Fits all sizes, no cuff size selection or disinfection required
  • Correlation with all sleep events

*Gehring, J., Gesche, H., Drewniok, G. et al. Sleep Breath (2018) 22: 337.

How does it work?

SOMNOmedics uses an innovative patented algorithm to measure blood pressure via the Pulse Transit Time (PTT). The PTT is the time required for the pulse wave to propagate along the vessel wall between two defined points. In the case of the SOMNOtouch RESP – From the left ventricle of the heart (defined by the ´R´peak of the ECG) – to the detection of the pulse wave at the finger tip (detected by the plethysmograph).

Taking a one point calibration at the beginning of the sleep study allows us to `set` the software‘s algorithm – and measure blood pressure continuously throughout the measurement. Because every single pulse wave is detected, a continuous “Beat-to-Beat”- recording and analysis is possible. Reduce artifacts and increase the number of reliable data points – all in a continuous, non-invasive and non-reactive way.