Arthur Le Coz

Sleep does not stay in its lane. Fragments of it leak into wakefulness, and I study what happens when they do.

During my PhD at the Paris Brain Institute, under Thomas Andrillon, I learned to read these intrusions across very different brains, from healthy minds pushed to exhaustion to clinical populations where the boundary between sleep and wake breaks down. Two findings anchor the work. Cortical slow waves track the rise of mental fatigue and predict the lapses it produces. And in patients caught mid-hallucination, neural signatures emerge that hint at a new form of local REM sleep.

My postdoc takes this question out of the lab. Slow waves and attentional lapses behave neatly under controlled conditions. The harder problem is what they become in the wild, where fatigue, sleep pressure, and real cognitive demand all pull at once. 

Selected publications

Arthur Le Coz, Raphael Vollhardt, Pierre Champetier, Ruben Herzog, Smaranda Leu-Semenescu, Pauline Dodet, Valerie Attali, Ana Gales, Delphine Oudiette, Isabelle Arnulf, Thomas Andrillon (2025 - Preprint). EEG Signature of Idiopathic Hypersomnia: Insights from Sleep Microarchitecture and Hypnodensity Metrics.