I am a French research scientist specialized in sleep and dreaming.

I obtained in December 2017 a PhD in neuroscience, with honors, from Lyon 1 University. My doctoral project was conducted with Dr. Perrine Ruby, and aimed at understanding how and why we sometimes recall our dreams and sometimes forget them, using several approaches such as EEG, fMRI and dream content analysis. Since Feb 2018, I am working with Pr. Matthew Walker, at U.C Berkeley, studying the impact of sleep deprivation on the brain.

I also have a strong research interest in statistics and signal processing. I am the (co)-founder of two Python open-source packages which are currently under development: Sleep (sleep scoring and analysis, part of the Visbrain suite) and Pingouin (statistics).

Contact info:
raphaelvallat9 [at] gmail.com
Center for Human Sleep Science (Walker Lab)
University of California, Berkeley


Pingouin: a statistical package in Python

April 2018

I am very happy to introduce my new open-source Python package, called Pingouin. Pingouin is born out of a personal need to reduce and simplify the number of steps in my statistical analyses. Pingouin provides simple and easy-to-grasp statistical functions for computing ANOVA, post-hoc tests, robust correlations, Bayes factors and effect sizes. Pingouin is based on Pandas and therefore allows to leverage the power of this latter. Learn more on the documentation or check the code on GitHub.

Post doctoral position at U.C Berkeley

November 2017

I am thrilled to announce that I will join Pr. Matthew Walker at U.C Berkeley (USA) for a two-years post-doctoral position starting February 2018.

New papers out

October 2017


Link to my full curriculum vitae (pdf format - last updated April 2018)

  • Education

2018-Present Postdoctoral fellow, Walker lab, U.C. Berkeley
2014-17 PhD in Neuroscience, with honors, Lyon 1 University
2012-14 Master degree in Neuroscience, cum laude, Lyon 1 University
2009-12 Bachelor degree of Cognitive Sciences, summa cum laude (ranked 1st), Lyon 2 University
  • Expertise

Methods Polysomnography, sleep studies, combined EEG-fMRI, resting-state fMRI, behavioural studies
Analysis Sleep scoring, ERP, EEG and fMRI signal processing, functional and connectivity MRI analyses, dream content analysis
Programming Python, Matlab, CONN Toolbox, SPM, FSL, HTML, LateX, Shell, R, PsychoPy
  • Teaching

Neurobiology / Neuroanatomy, 1st and 2nd year of Bachelor Degree in Biology (145h)
Social science, 1st year of Medicine (50h)
Neuro-imaging (fMRI analysis), Neuroscience Master degree (~10h)
  • Outreach

Elected representative of the doctoral students in Lyon Neuroscience Research Center council
Organizer of the Doctoral Day of the Lyon Federative Research Structure in Health
Invited oral presenter for a general public conference on sleep and dreams (1h, at Lyon town hall)
Organizer of a thematic week on neuroscience for 6 high-school students
Organizer and chairman of "Les Saisons du CRNL" conference on neurosciences and society


Please find below a list of publications (last updated March 2017)
PDF versions are provided for individual, noncommercial purposes only. These files may not be reposted without permission. Copyright and all rights therein resides with the respective copyright holders, as stated within each paper.

Software development

Visbrain | SLEEP

The SLEEP module of the Visbrain package is an open-source software for visualization and analysis of sleep polysomnographic data. Learn more on the official documentation or read the peer-reviewed publication.


Please find below some tutorials regarding the analyses I specialize in.