Insufficient sleep does not, therefore, push the brain into a negative mood state and hold it there. Rather, the under-slept brain swings excessively to both extremes of emotional valence, positive and negative.
The Author of this Quote
![Matthew Walker PhD](/_next/image?url=https%3A%2F%2Fassets.heroic.us%2Fauthors%2Fheadshots%2Fmatthew-walker-phd.jpg&w=640&q=75)
Author
Matthew Walker PhD
Professor of Neuroscience at UC Berkeley, Sleep Scientist at Google and Author of Why We Sleep