Sleep Made Clear

Tracking 6 min read

What a Polysomnogram Actually Records

A polysomnogram is a clinical sleep study that simultaneously records brain activity, eye movement, muscle tone, and breathing.

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Routine 6 min read

How Caffeine Timing Affects Sleep Onset

Caffeine blocks the brain’s sleep-pressure signal for hours, with effects that persist well beyond when alertness fades.

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Routine 6 min read

Why Sleep Hygiene Rules Actually Work

Sleep hygiene practices work by reinforcing the circadian and homeostatic systems that regulate the drive to sleep.

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Environment 6 min read

How Mattress Firmness Is Measured

Mattress firmness is measured with an indentation load test that produces a numeric rating with no universal industry standard.

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Environment 6 min read

What Blue Light Does to Sleep Onset

Blue-toned light suppresses melatonin release more than other wavelengths, delaying the body’s natural signal for sleep.

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Disruption 6 min read

How Sleep Apnea Disrupts Sleep Architecture

Sleep apnea repeatedly interrupts breathing during sleep, fragmenting the deep and REM stages the body needs most.

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