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Science in action.

Research and scientific rigor are cornerstones of everything we do at the Dreem company. Here’s a closer look at some of our current scientific projects.


Project 2: Dreem hardware
compared to PSG

At the Dreem company we’re constantly fine-tuning our hardware to make it as accurate as possible. Dreem recently published a clinical study testing our hardware against PSG.

How Dreem hardware compares to PSG in the tracking of sleep stages.

Sleep clinics and labs employ a sleep monitoring technology called polysomnography (PSG). Brain activity, heart rate, respiratory rate and movement are measured but it is brain activity that gives the most precise data of a person’s sleep.

Dreem hardware is equipped with sensors that measure these biomarkers, in order to monitor sleep as precisely as PSG. On the graph you’ll see how the signal coming from Dreem’s sensors compares with that of the PSG in tracking sleep stages (Wake, N1, N2, N3 and REM sleep).

* Sources: The Dreem Headband as an Alternative to Polysomnography for EEG Signal Acquisition and Sleep Staging - Pierrick J. Arnal, Valentin Thorey, Michael E. Ballard, Albert Bou Hernandez, Antoine Guillot, Hugo Jourde, Mason Harris, Mathias Guillard, Pascal Van Beers, Mounir Chennaoui, and Fabien Sauvet.

Measuring and
scoring sleep

A traditional PSG requires experts to manually score the readings. Dreem hardware’s built-in algorithms perform the same task. Here’s how Dreem compares to the experts as well as a basic sleep tracker.

* Sources: Dreem - Arnal PJ, Thorey V, Ballard ME et al. The Dreem Headband as an Alternative to Polysomnography for EEG Signal Acquisition and Sleep Staging. Biorxiv doi:

** Sources: AASM Experts - Danker-Hopfe H, Anderer P, Zeitlhofer J et al. Interrater reliability for sleep scoring according to the Rechtschaffen & Kales and the new AASM standard. J Sleep Res. 2009 Mar;18(1):74-84. doi: 10.1111/j.1365-2869.2008.00700.x.

*** Sources: Trackers - Beattie Z, Oyang Y, Statan A et al. Estimation of sleep stages in a healthy adult population from optical plethysmography and accelerometer signals. Physiol Meas. 2017 Oct 31;38(11):1968-1979. doi: 10.1088/1361-6579/aa9047.

Project 1: Dreem & CBT-I

Insomnia, that is reoccuring trouble falling asleep and staying asleep, is measured by a questionnaire assessment tool known as the Insomnia Severity Index (ISI). The final score (from 0-28) shows how severe someone’s insomnia is. Anything over 14 is considered clinical insomnia.

Cognitive Behavioral Therapy for Insomnia (CBT-I) is widely considered by the medical community, including the ACP and APA.

Ye Y, Chen N, Chen J, et al Internet-based cognitive–behavioural therapy for insomnia (ICBT-i): a meta-analysis of randomised controlled trials BMJ Open 2016;6:e010707. doi: 10.1136/bmjopen-2015-010707

* Sources: Test on 154 people.

Redefining how we treat poor sleep

At the Dreem company, we’re constantly looking for new ways to make effective sleep solutions accessible to as many people as possible. Our coaching programs help people break the cycle of difficult sleep, addressing thinking and modifying actions in order to break the cycle of bad sleep and put in place new sleep routines. The results so far have proven extremely promising.


of users no longer meet the clinical cutoff for insomnia.

What about the results?

Faster falling asleep
Overall impact

of users fall asleep faster and more easily.

More precisely

less time falling asleep (Average for users who took over 30 minutes to fall asleep).

Less nocturnal awakenings
Overall impact

of users have less fragmented nights.

More precisely

less nocturnal awakenings on average.

*Data taken from users on completion of the Dreem coaching program.

Meet our board of experts

Dr. Emmanuel Mignot

Emmanuel Mignot is the director of the Stanford Center for Sleep Sciences and Medicine. A psychiatrist and renowned researcher, Mignot is the author of over 200 scientific publications. He is well-known for his work on narcolepsy in particular and more recently on the use of AI in the large-scale analysis of sleep disorders. He joined the Dreem adventure 2 years ago. As the president of our advisory board, he helps day-to-day with our research projects as well as our scientific strategy.

Prof. Russell Foster

Russell Foster is a professor in circadian neuroscience at Oxford University, UK. He is also the head of both the Nuffield Laboratory of Ophthalmology and the Sleep and Circadian Neuroscience Institute (SNCI). He is especially known for his work on particular cells in the eye (the retinal ganglion cell) that detects light and transmits information to the circadian system.

Prof. Raphael Heinzer

Raphael Heinzer is the director of the Centre for Sleep Investigation and Research (CIRS), Lausanne, Switzerland. Dr. Heinzer is a specialist in sleep apnea and the epidemiology of sleep disorders in the general population. He helps Dreem to define our research and study protocols and brings a critical eye to our developments in the field of sleep apnea.

Prof. Christof Koch

Christof Koch is one of the most influential scientists working today. President of the Allen Institute for Brain Science, Seattle, Koch is recognized for his work on the neural basis for consciousness, mixing neuroscience with philosophy. He is also the author of numerous works on the subject. Passionate about sleep, in itself a modified state of consciousness,, he advises Dreem on our different scientific projects (strategy, research protocols, clinical trials and so on).

Our partnerships

University of Cambridge, UK

Decoding the subjective experience of meditative states from daily EEG recordings.

Washington University St Louis Hospital, USA

Postoperative delirium linked with cognitive and EEG markers.

Cardiff University, UK

Optimizing auditory closed-loop stimulation of slow waves.

University of Friburg, Switzerland

Targeted memory reactivation during sleep.

Bard University, US

Targeted memory reactivation during naps in healthy volunteers.

Biomedical research center of the armed force, France

Sleep recording in various protocols including subjects with sleep debt.

Human Brain Project, France

European SlowDyn Consortium (FLAGERA) on Slow Wave Dynamics.

University of Paris Sorbonne Cité, France

Optimisation of slow wave sleep by non-invasive techniques.

Scientific papers & publications

Interested in using Dreem
for research purposes
or professional projects?

Dreem Healthcare

Learn more about
the Dreem 2 experience

See how it works