Book Freak 173: Why We Sleep
The Science of Sleep and Dreams
Why We Sleep explores the science of sleep and its profound impacts on our physical and mental wellbeing. Matthew Walker, a professor of neuroscience and psychology at UC Berkeley and former Harvard faculty member, presents compelling research showing that sleep is a fundamental pillar of human health, memory, creativity and emotional stability.
Through decades of scientific studies, Walker demonstrates how quality sleep enhances nearly every biological function — from immune system strength to memory consolidation to emotional regulation.
Four key lessons from the book:
On Sleep's Role as Nature's Life Support
Sleep is not optional but fundamentally necessary for life across all species.
“Sleep is the single most effective thing we can do to reset our brain and body health each day — Mother Nature’s best effort yet at contra-death. Unfortunately, the real evidence that makes clear all of the dangers that befall individuals and societies when sleep becomes short have not been clearly telegraphed to the public.”
On The Misunderstood Nature of Dreams
Dreams serve essential functions beyond simple entertainment of the sleeping mind.
"REM-sleep dreaming offers a form of overnight therapy. That is, REM-sleep dreaming takes the painful sting out of difficult, even traumatic, emotional episodes you have experienced during the day, offering emotional resolution when you awake the next morning… Concentrations of a key stress-related chemical called noradrenaline are completely shut off within your brain when you enter this dreaming sleep state. In fact, REM sleep is the only time during the twenty-four-hour period when your brain is completely devoid of this anxiety-triggering molecule."
On Society's Dangerous Dismissal of Sleep
Modern society's neglect of sleep has severe consequences.
"Within the space of a mere hundred years, human beings have abandoned their biologically mandated need for adequate sleep — one that evolution spent 3,400,000 years perfecting in service of life-support functions. As a result, the decimation of sleep throughout industrialized nations is having a catastrophic impact on our health, our life expectancy, our safety, our productivity, and the education of our children. This silent sleep loss epidemic is the greatest public health challenge we face in the twenty-first century in developed nations."
On Sleep's Role in Memory and Learning
Sleep actively processes and strengthens our memories and learning.
"Practice does not make perfect. It is practice, followed by a night of sleep, that leads to perfection."
Book Freak Paid Subscribers Get Full Access to Past Issues!
It’s just $5 a month or $45 a year. Click the upgrade button to find out more.
Buy a Book Freak Unclassified ad for just $50 and reach over 14,400 readers!
Like newsletters like Book Freak? Here are some other newsletters our readers also enjoy. Explore
I use a fantastic app called Reader, the first read-it-later / newsletter / RSS-reading / web-highlighting app for power readers. Save everything to one place, highlight like a pro, and replace several apps with Reader. Book Freak readers can try it free for 60 days.
Setapp is a hand-picked collection of quality software, packed with prime apps. There’s no store — just a folder on the Mac, and no hidden costs — just a flat monthly fee. It’s simple, and users love it. Try it here!
Book Freak is published by Cool Tools Lab, a small company of three people. We run the Cool Tools website, a video reviews YouTube channel, and other newsletters, including Gar’s Tips & Tools, What’s in my NOW?, and Recomendo. You can also support our work by becoming a patron via Patreon.