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What Sleep Is Actually For
You know you slept badly. You are the last to notice what it cost.
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Sleep debt
Sleep debt is the cumulative effect of not getting enough sleep over days or weeks.
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Chronotype
A chronotype is a person's natural biological tendency to sleep and be active at specific times during a 24-hour day.
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Circadian Rhythm
Circadian rhythms are roughly 24-hour internal biological cycles.
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REM Sleep
REM sleep is a distinct phase of sleep where the brain acts nearly awake while the body's skeletal muscles are paralyzed.
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Slow-Wave Sleep
Slow-wave sleep is the deepest stage of non-REM sleep, defined by large delta waves that help the brain consolidate declarative memories.
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Melatonin
Melatonin is a hormone produced in the brain that tells the body when it is dark outside.
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Insomnia
Insomnia is a sleep disorder where a person struggles to fall asleep or stay asleep for as long as needed.
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Cognitive behavioral therapy for insomnia
Cognitive behavioral therapy for insomnia is the first-line treatment for chronic insomnia, relying on sleep restriction and stimulus control.