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Sleep

Learn what shapes your nights — from circadian rhythm and sleep quality to the disorders that disrupt them — and what actually helps you rest.

Most read

May 19, 2026

The 8-hour sleep rule isn’t the full story

Most people think better sleep starts with sleeping longer. But new Welltory data suggests the story is more complicated.

Sleep quality

July 20, 2026

The Best Sleep Trackers, Compared: What the Accuracy Data Actually Shows

What validation studies against polysomnography actually show about Oura, Apple Watch, Fitbit, Garmin, and WHOOP.

Sleep tracking

Latest articles

Want ring-level sleep and stress insights without buying a ring?

Sleep tracking

October 28, 2026

Your Apple Watch already records heart rate, HRV, sleep stages, a Sleep Score, overnight Vitals and Training Load — and on the newest models a Readiness score. What each one is, how accurate the sleep and HRV data are, what the watch leaves unexplained, and whether you need another device to read it.

Already have an Apple Watch? What it measures and what it doesn't explain

Sleep tracking

October 28, 2026

An evening table with a cup of coffee, a glass of red wine, cheese, nuts and chocolate.

Eating before bed: what a late dinner does to your sleep, heart rate and reflux

Sleep quality

October 22, 2026

Illustration of a doe standing in tall grass at dusk under an early evening sky.

Do we get an extra hour of sleep when the clocks fall back?

Circadian rhythm

October 21, 2026

Illustration of a woman sitting on grass at dusk with a city skyline behind her.

Why is jet lag worse coming home?

Circadian rhythm

October 20, 2026

Illustration of a woman asleep under a duvet in warm pink and deep blue light.

What does jet lag feel like?

Circadian rhythm

October 20, 2026

Illustration of a lavender field at dusk, the sky shifting from pink to deep blue over distant hills.

Jet lag calculator: how many days it takes, and what to do on each of them

Circadian rhythm

October 20, 2026

A soft heap of oversized pillows in pink, blue and green under evening light.

Sleep apnea test: home study vs lab, and what the AHI number means

Sleep Apnea

October 16, 2026

Does masturbation help you sleep? What the research says about orgasm, stress and rest

Sleep quality

October 8, 2026

Is it bad to sleep with a fan on? What the research says

Sleep environment

October 7, 2026

Illustration of a woman with eyes closed, arms folded over her chest, listening inward against a deep blue background.

Why your sleep score and how you feel disagree — and which one to trust

Sleep quality

October 6, 2026

Illustration of a night sky over dark blue hills, with pink-lit clouds and a thin crescent moon.

When tracking makes it worse: orthosomnia and chronic illness

Sleep tracking

October 6, 2026

Why do I pee so much at night? What's normal, the causes, and how to stop it

Sleep quality

October 1, 2026

Sleep anxiety: why worrying about sleep keeps you awake — and how to break the loop

Insomnia

September 30, 2026

Revenge bedtime procrastination: why you stay up late, and what actually helps

Sleep quality

September 29, 2026

Wrist temperature on Apple Watch: what the number actually measures

Sleep tracking

September 24, 2026

Oura Ring vs Apple Watch: what the accuracy data shows, and whether you need a ring at all

Sleep tracking

September 24, 2026

Melatonin: why the dose matters less than the timing

Circadian rhythm

September 23, 2026

Sleep deprivation and brain fog: why chronic insomnia clouds your thinking — and what actually helps

Insomnia

September 14, 2026

How to treat chronic insomnia: the fastest path to better sleep (and why 12 minutes won't cure it)

Insomnia

September 14, 2026