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What it argues
Sleep Smarter is Shawn Stevenson's practical guide to improving sleep quality. Stevenson, a fitness and nutrition podcaster who reversed his own serious health problems partly through addressing sleep, wrote the book as a collection of evidence-backed and experiential strategies for getting more and better rest. The book is structured as a twenty-one-day program of sleep improvements, each chapter adding a new practice or addressing a common sleep-disrupting habit.
The book covers a wide range of factors that influence sleep: light exposure and its effect on melatonin production, the importance of sleeping in a cool and dark environment, the timing of caffeine and alcohol consumption, the relationship between exercise and sleep quality, the role of nutrition in supporting sleep hormones, and the psychological dimensions of sleep anxiety. Stevenson draws on research from sleep science as well as his clinical and coaching experience.
What it gets right
- 1.
Light exposure is the primary regulator of circadian rhythm. Evening exposure to artificial blue light suppresses melatonin production and delays sleep onset, often by one to two hours.
- 2.
Core body temperature needs to drop for sleep to begin. A cooler bedroom — around 65 to 68 degrees Fahrenheit — facilitates this and consistently improves sleep quality in research settings.
- 3.
Caffeine has a half-life of five to six hours in most adults. Consuming it after midday keeps measurable levels in the bloodstream at bedtime, degrading sleep even when people feel they can fall asleep normally.
What it covers
Who wrote it
Shawn Stevenson is an American health and fitness author and the host of The Model Health Show podcast. He studied biology and kinesiology and works as a nutritional consultant and performance coach. His personal health journey — recovering from degenerative disc disease and scoliosis through dietary and lifestyle interventions — informs much of his writing. Sleep Smarter, published in 2014, was his first book and became a bestseller in the health and wellness category. He lives in St. Louis, Missouri.
