#267 — The Kingdom of Sleep

Sam Harris speaks with Matthew Walker about the nature and
importance of sleep. They discuss sleep and consciousness, the
stages of sleep, sleep regularity, light and temperature, the
evolutionary origins of sleep, reducing sleep, the connection
between poor sleep and all-cause mortality (as well as
Alzheimer’s disease, diabetes, obesity, and heart disease), sleep
across species, learning and memory, mental health, dreams as
therapy, lucid dreaming, heart-rate variability, REM-sleep
behavior disorder and parasomnias, meditation and sleep, sleep
hygiene, different types of insomnia, caffeine and alcohol, sleep
efficiency, bedtime restriction, cognitive-behavioral therapy,
napping, sleep tracking, and other topics.


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Learning how to train your mind is the single greatest investment
you can make in life. That’s why Sam Harris created the Waking Up
app. From rational mindfulness practice to lessons on some of
life’s most important topics, join Sam as he demystifies the
practice of meditation and explores the theory behind it.