• An overview of the available sensor modules for the SOMNOwatch Plus
    An overview of the available sensor modules for the SOMNOwatch Plus


Our SOMNOwatch® plus encases a digital triaxial accelerometer, ambient light sensor and event marker. Combined with other modules and sensors, the SOMNOwatch plus can becomes one of the smallest somnographs or respiratory screeners. We can also offer longterm blood pressure recordering, longterm EEG recording (via a single sensor or a headbox) or even long-term core temprature rescrording. Almost anything is possible – allowing you to gather specific data for your research.


Research Grade Sensors

With programable software allowing extensive customisation

7 Internal Channels

Body Position/Movement (seperate acc for 3 axis), Ambient light, patient marker with acoustic tone


High sampling rates

256/32 Hz

Data Compression for long recording times

Allowing up to 25 day study duration (depending on number of sensors attached)

1 Channel AUX input with up to 8 available Sensors

BP, Resp, 6 channel EEG, long-term ear temp and much much more

Double Plot & Raster View

Over the complete measurement day by day – double plot for improved circadian analysis

Powerful, miniaturised, multi channel recorder

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

As any multi-channel system, the SOMNOwatch® plus can replace several common devices while providing excellent signal quality.

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)
  • 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.

Add a 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

Long-Term ECG

SOMNOwatch® plus can store the raw data from a single channel ECG for up to 250 hours. The correlation between Heart Rate, its Rhythm, Actigraphy and Body Position can give very interesting information for the diagnosis of cardiovascular disease and help in patients rehabilitation.

  • 1-Channel ECG
  • Recognition of Brady-/Tachycardia and Arrhythmia
  • Heart Rate Variability (HRV) at a sampling rate of 128/
  • Sympatho-Vagal Balance (SVB)

Temperature Recording (inner ear)

  • Long time temperature measurement in the ear
  • Comfortable
  • 12 Days Recording Time
  • Correlation to light, motor activity and body postition
  • Determination of rel. Min. and Max

Optional 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.

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Please email sales(at)somnomedics(dot)de or talk to one of our international sales advisors on +49 931 35909 40.