NightWatch+

What NightWatch+ does

NightWatch+ is a medical device product developed and commercialized by LivAssured B.V., a Dutch private limited company founded in 2013 and headquartered in Leiden, Netherlands. The company commercially launched NightWatch in 2018 and currently serves more than 10,000 families across 15+ countries, with end users concentrated in households, residential care facilities, and clinical research settings where nocturnal epileptic seizure monitoring is required. The customer base is primarily families with children or adults living with epilepsy who require unattended nighttime surveillance, supplemented by care institutions and clinical researchers conducting trials in seizure detection.

The core product is a wearable arm-worn sensor that combines photoplethysmography (PPG) and a 3D accelerometer to capture autonomic and motion signals during sleep, feeding those signals into a proprietary algorithm trained to detect epileptic seizures. The company reports clinical validation of 86% median sensitivity for generalized tonic-clonic seizures in adults, 100% sensitivity in children, and a false-alarm rate of approximately 0.04 per hour. The device has received EU MDR Class IIa certification, ISO 13485 manufacturing certification, and FDA clearance for pediatric use (ages 4–16) in the United States. Adjacent offerings include a NightWatch Research Kit for clinical trials and a NightWatch API for third-party integrations.

The business model is a one-time hardware sale rather than a subscription. Pricing is €1,890 in the EU and $1,990 in the US (prescription required), with a PRO tier priced at €2,250 currently available in Germany and Austria. Distribution is direct-to-consumer via the company's website and through a network of 11+ regional distributors globally, with US distribution handled exclusively through Unitron MedX. The leadership team is led by CEO Jeroen van den Hout, with founders Mark Bloemendaal and Asmund Tielens (CTO) overseeing the technology and product functions.

Name

NightWatch+

Legal name

LivAssured B.V.

Website

https://nightwatchepilepsy.com

Company type

Private

Founded year

2013

Operating status

Operating

Headcount range

11–50 employees

Short description

NightWatch+ is a wearable arm sensor developed by LivAssured B.V. that detects nocturnal epileptic seizures in real time using PPG and accelerometer signals, serving families, residential care providers, and clinical researchers across 15+ countries.

Ownership category

akta.pro rank

Product category

Epilepsy Monitoring Devices

NAICS

Electromedical and Electrotherapeutic Apparatus Manufacturing (334510)

SIC

Electromedical & Electrotherapeutic Apparatus (3845), Measuring & Controlling Devices, Nec (3829)

akta.pro industry

PRIMARYHLAHACAE

Neurological Monitoring (EEG, Seizure/Sleep/Neuro Wearables)

Healthcare & Life Sciences/Medical Devices & Diagnostics/Patient Monitoring, Wearables & Remote Diagnostics

SECONDARYHLAHAGAB

Sleep Diagnostics & Monitoring (PSG/Home Sleep Testing, Actigraphy)

Healthcare & Life Sciences/Medical Devices & Diagnostics/Respiratory & Sleep Therapy Devices

SECONDARYHSAHAAAL

Personal Emergency Response (PERS) & Medical Alert Monitoring

Home & Personal Services/Home Security, Alarm & Smart Home Services/Monitored Security & Intrusion Alarm Services

Keywords

• Seizure detection devices
• Epilepsy monitoring
• Wearable medical devices
• Nocturnal seizure alerts
• Remote patient monitoring

Headquarters

HQ city

Leiden

HQ country

Netherlands

HQ region

Europe

Offices3 records

Markets served

GTM type

B2C

Offering type

Hardware or Manufacturing

Cost components

Supply Chain, Personnel, Technology or R&D, Operations, Marketing or Sales

Revenue model

1. NightWatch+ Hardware Sales: One-time purchase of NightWatch+ device (sensor arm module + base station). No subscription required. Price varies by region: €1,890 in EU, $1,990 in US (FDA-cleared version). Includes 2-year warranty, free portal access, and helpdesk support. Replacement parts (elastic straps, comfort patches, sensors) available for separate purchase.
2. NightWatch+ PRO Hardware: Premium hardware tier at €2,250 offering additional features such as third-party app integration and external alarm forwarding capabilities, distinct from the standard HOME version at €1,890.

Pricing tiers

Go-to-market motion2 records

Distribution channels5 records

Marketing channels7 records

Core offering

NightWatch+ is a wearable nocturnal seizure detection system consisting of a wireless upper-arm sensor (using PPG for heart rate and a 3D accelerometer for movement) paired with a base station that alerts caregivers via audio-visual alarms when clinically urgent epileptic motor seizures (tonic-clonic, tonic, hyperkinetic, myoclonic) are detected. The device is intended for people aged 4+ diagnosed with epilepsy who experience nocturnal seizures, and is sold to families, residential care facilities, and clinical research users across more than 15 countries in Europe, the Middle East, Australia and the US. Companion offerings include the NightWatch+ portal, a Data API and a Research Kit for clinical trials.

Product overview

NightWatch+ offers a unified seizure detection ecosystem built around a wearable sensor and base station system. The core NightWatch+ product combines an arm-worn sensor (using PPG heart rate monitoring and 3D accelerometer for movement tracking) with a base station for caregiver alerts. The portfolio includes the NightWatch Data Platform and Portal for online monitoring, the NightWatch API for third-party research integrations, and a specialized NightWatch Research Kit (with IR camera and raw data collection) for clinical trials. The company also offers the original NightWatchO model, plus accessories including elastic straps and comfort patches.

Differentiator

Problem solved

Functional benefit

Products and services

• NightWatch+ Seizure Detection System NightWatch+ is a wearable seizure detection system for nocturnal epileptic motor seizures. It consists of a comfortable wireless arm sensor that continuously monitors heart rate (via PPG) and movement (via 3D accelerometer), paired with a base station that issues audio and visual alarms to caregivers when clinically urgent seizures are detected. It is intended for people aged 4 years and older diagnosed with epilepsy who experience nocturnal motor seizures, and for use at home or in residential care facilities.
• NightWatch+ PRO NightWatch+ PRO is a premium tier of the NightWatch+ seizure detection system offering additional features including third-party app integration and external alarm forwarding (e.g., to nurse call systems). It is designed for professional care settings and caregivers needing integration with existing care infrastructure.
• NightWatch Portal The NightWatch Portal is an internet-connected online data portal that gives caregivers access to detailed sensor data, heart rate and movement recordings during sleep, and insights into why alarms were triggered. It is provided free of charge to NightWatch+ users and allows review of nightly data and seizure events.
• NightWatch Research Kit The NightWatch Research Kit is a plug-and-play research solution for clinical trials and observational studies. It includes the NightWatch device, an integrated PC with external hard drive, a 4G router for remote access, an IR night vision camera for continuous video and audio reference data, and an active cooling system. It enables long-term objective collection of nocturnal seizure data including raw PPG, accelerometer XYZ data, body position, and timestamped seizure alarms.
• NightWatchO NightWatchO is the original NightWatch model, a wearable seizure detection system offered alongside the current NightWatch+ version. It includes a two-year warranty and is designed for maintenance-free everyday use.

Quantifiable outcome

• 86% median sensitivity for all major motor seizure types in adults; 100% in children
• +4 more outcomes

Named customers3 records

Segments3 records

Ideal customer profiles3 records

Technology focussed Yes

API detail

Has API

Yes

API docs

API detail

Core technology

AI maturity

App detail

Integration3 records

AI capability3 records

Feature6 records

Partnerships

18 partnerships are on record, tiered core and major.

• Tele-Epilepsie Consortium (UMC Utrecht, Eindhoven University of Technology, SEIN, Kempenhaeghe, patient groups, EpilepsyNL)coreStrategic or Co-development Partner · 1 January 2011Established in 2011, the Tele-Epilepsie Consortium united Dutch leading epilepsy centers (SEIN, Kempenhaeghe), UMC Utrecht, Eindhoven University of Technology, patient groups, and EpilepsieNL. This consortium conducted decades of conjoined research and developed the innovative system to remotely warn caregivers of clinically urgent seizures, which became the foundation of NightWatch+. LivAssured was founded in 2013 to commercialize this technology, with NightWatch launching in 2018.
• SEIN (Stichting Epilepsie Instellingen Nederland)coreStrategic or Co-development PartnerSEIN is a Dutch epilepsy center that co-developed NightWatch's detection algorithm technology. SEIN neurologists (including Dr. Roland Thijs) serve on the NightWatch advisory board. SEIN validated the detection algorithm over thousands of nights in clinical studies and residential settings.
• Kempenhaeghe (Academic Center for Epileptology)coreStrategic or Co-development PartnerKempenhaeghe is an academic center for epileptology that co-developed NightWatch's detection algorithm. Neurologists including Prof. Dr. J.B.A.M. Arends serve on the NightWatch advisory board. Kempenhaeghe validated the detection algorithm in clinical studies.
• UMC UtrechtcoreStrategic or Co-development PartnerPart of the Tele-Epilepsie Consortium, UMC Utrecht contributed to the foundational research on nocturnal seizure detection using heart rate and motion analysis. Dr. F.S.S. Leijten serves on the NightWatch advisory board.
• Eindhoven University of Technology (TU/e)coreStrategic or Co-development PartnerPart of the Tele-Epilepsie Consortium, contributing technical expertise in signal processing and algorithm development for the multimodal seizure detection technology.
• EpilepsyNLcoreStrategic or Co-development PartnerDutch patient organization for epilepsy, part of the Tele-Epilepsie Consortium. Represents patient perspectives in the development of NightWatch+. Director J. Wijnhoud serves on the NightWatch advisory board.
• AFEVI (France)majorChannel Partner/ Reseller/ DistributorFrench distributor for NightWatch+ handling sales, support, and customer relationships in France. Also provides professional/institutional sales through their website. Contact: [email protected], +33 (0)6 86 92 86 62.
• LEISNER ApS (Denmark & Sweden)majorChannel Partner/ Reseller/ DistributorDistributor for NightWatch+ in Denmark and Sweden. Contact: [email protected], +45 (0)6371 3050. Website: leisner.dk/nightwatch-plus.
• Seizure Alert AustraliamajorChannel Partner/ Reseller/ DistributorAustralian distributor for NightWatch+. Contact: [email protected], +61 (0)492 961 777. Website: seizurealertaustralia.com.au.
• Emergency Response Limited / Tunstall (Ireland)majorChannel Partner/ Reseller/ DistributorIrish distributor (operating as Tunstall Emergency Response) for NightWatch+. Contact via tunstalleemergencyresponse.ie, +353 (0)818 999 247.
• Sigma Health Care (Israel)majorChannel Partner/ Reseller/ DistributorIsraeli distributor for NightWatch+. Contact: sigma-hc.co.il, +972 (0)9 954 6426.
• Netnordic (Norway)majorChannel Partner/ Reseller/ DistributorNorwegian distributor for NightWatch+. Contact: [email protected], +47 (0)67 247 365.
• Picomed (Norway)majorChannel Partner/ Reseller/ DistributorNorwegian distributor for NightWatch+. Contact: [email protected], +47 (0)37 11 99 50. Website: picomed.no.
• Mitoterapia (Poland)majorChannel Partner/ Reseller/ DistributorPolish distributor for NightWatch+. Contact: [email protected], +48 (0)177 707 357. Website: mitoterapia.com.
• NightCare4U GmbH (Switzerland)majorChannel Partner/ Reseller/ DistributorSwiss distributor for NightWatch+. Contact: [email protected], +41 (0)32 313 2016. Website: shop.nightcare4u.ch.
• Nervovita Medikal (Turkey)majorChannel Partner/ Reseller/ DistributorTurkish distributor for NightWatch+. Contact: [email protected], +90 (0)850 241 9315. Website: nervovita.com.
• EpilepsyAlarmsUK (United Kingdom)majorChannel Partner/ Reseller/ DistributorUK distributor for NightWatch+. Contact: [email protected], +44 (0)800 180 88 33. Website: epilepsyalarms.co.uk.
• Unitron MedX, LLC (USA)majorChannel Partner/ Reseller/ DistributorUS-based manufacturing partner and distributor for the FDA-cleared US version of NightWatch+. Handles assembly, fulfillment, and customer support in the US market. Address: 1941 Evans Road, Cary, NC 27513-2041. Manages the prescription-based ordering process and US customer support at +1 (919) 694 6670.

Scale indicators7 records

Recent moves10 records

Expansion highlights6 records

Broad incumbents

• Tunstall Healthcare: Tunstall is a major telecare and PERS provider also distributing NightWatch+ in Ireland; its broader portfolio of personal emergency response and remote monitoring solutions overlaps with NightWatch+'s caregiver alert functionality.
• Garmin: Garmin's wearables incorporate heart rate monitoring and body movement tracking with 24/7 health features, and could in the future expand into seizure detection, partially overlapping with NightWatch+'s wearable monitoring approach.
• Apple (Apple Watch): Apple Watch has added seizure detection features and benefits from massive consumer adoption, broad health ecosystems, and subscription tiers, representing a competitive alternative to dedicated epilepsy wearables.
• Boston Scientific (Neurostimulation): Boston Scientific's Vagus Nerve Stimulation (VNS) therapy targets refractory epilepsy, competing indirectly with NightWatch+ by addressing the same patient population through a neurostimulation device rather than external monitoring.

Direct peers

• Smart Monitor (Inspyre): Smart Monitor's Inspyre is a wrist-worn smartwatch-style device that detects repetitive motion patterns associated with seizures and alerts caregivers, directly competing in the same nocturnal seizure-detection category.
• SAMi (Sleep Activity Monitor): SAMi is a sleep activity monitor that uses a camera and motion sensor to detect unusual movements during sleep and alerts caregivers, serving a similar nighttime seizure/convulsion monitoring use case.
• Epi-Care (Bfitting): Danish-developed Epi-Care free is a wearable seizure detection device positioned for nocturnal epilepsy monitoring, offering a similar patient-to-caregiver alert workflow as NightWatch+.
• Empatica: Empatica's Embrace2/EpiMonitor is a wearable wrist device with FDA-cleared seizure detection, directly competing with NightWatch+ in the same target use case (epilepsy caregiver alerting) using PPG and accelerometer data.

Emerging players

• Eysz: Eysz is developing digital biomarkers and software for neurological event detection, including epilepsy, and intersects with NightWatch+ in the broader objective-seizure-monitoring space.
• Medpage (Easylink/Medpage Ltd): Medpage supplies a range of epilepsy and seizure movement monitors used in home and care settings, offering adjacent hardware solutions to families and care facilities for nocturnal seizure monitoring.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat6 records

Key risks6 records

Key highlights6 records

Customer concentration

• YouTubeyoutube.com/channel/UCLkY68uX3ifH0Y3Tpo0uaMg
• Facebookfacebook.com/EpilepsieAanvalsDetectie
• LinkedInlinkedin.com/company/nightwatch-epilepsy-detection
• Instagraminstagram.com/epi_nightwatch
• Xx.com/nightwatchalarm

Compliance3 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles13 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about NightWatch+