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Sleep Calculators Online
  • Sleep Calculator
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    • Sleep Timing
      • Coffee Nap Calculator
      • Bedtime Calculator
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    • Body Clock and Work
      • Circadian Rhythm Calculator
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      • Jet Lag Recovery Calculator
      • Daylight Saving Time Sleep Calculator
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      • Daily Caffeine Intake Calculator
    • Sleep Health Checks
      • Hours Awake Calculator
      • Insomnia Severity Calculator
      • Sleep Quality Calculator
      • Sleep Statistics Calculator
      • Sleep Score Calculator
      • Sleep Efficiency Calculator
      • Sleep Latency Calculator
      • Sleep Stage Percentage Calculator
      • AHI Calculator
    • Sleep by Age
      • Baby 24-Hour Sleep Calculator
      • Toddler Sleep Schedule Calculator
      • Bedtime Routine Planner
      • Sleep by Age and Gender
      • Baby Sleep Calculator
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    • Bedroom and Comfort
      • Bed Height Calculator
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      • Weighted Blanket Calculator
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    • Browse All 52 Sleep Tools
  • Sleep Guides
    • Best Time to Sleep
    • Foods That Help You Sleep
    • How to Get Rid of Sleep Inertia
    • Biphasic Sleep
    • Is Hitting Snooze Bad?
    • 20-Minute vs 90-Minute Nap
    • Best Time to Wake Up
    • How to Get More Deep Sleep
    • How to Get More REM Sleep
    • Social Jet Lag
    • Why Sleep Regularity Matters
    • How Late to Eat Before Bed
    • Newborn Sleep
    • What Is REM Sleep
    • Safe Sleep for Babies
    • Alcohol and Sleep
    • Baby Sleep Regressions
    • Sleep and Depression
    • Sleep Training Methods
    • Children’s Sleep Guide
    • Stages of Sleep
    • Sleep Cycles and Dreams
    • Why You Wake Up at 3 AM
    • Snoring Causes and Solutions
    • Sleep Apnea Health Risks
    • Sleep Hygiene 101
    • Browse All Sleep Guides
  • Pillow Reviews
    • Saybrook Adjustable Pillow
    • EPABO Contour Pillow
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Sleep Blog

The Sleep Calculators Online blog covers sleep science, sleep health and practical ways to sleep better. Articles explain how sleep stages and REM sleep work, why trouble falling asleep and waking at night happen, how your body clock shapes when you feel sleepy, and what sleep disorders such as sleep apnea, narcolepsy and restless legs look like.

Updated articles link to the research and health sources behind them, and many pair with a free tool such as the bedtime calculator, the sleep cycle calculator or the sleep debt calculator.

Looking for something specific? Browse sleep guides by topic, all sleep calculators or our pillow reviews. The newest articles are below.

Obstructive Sleep Apnea Symptoms: Signs At Night And By Day

October 23, 2026October 21, 2026 by Shakeel Muzaffar
Illustration for Obstructive Sleep Apnea Symptoms: Signs at Night and by Day: a dim bedroom with a phone, water glass and rumpled blankets

Quick Answer: The main symptoms of obstructive sleep apnea are breathing that stops and starts, gasping, snorting or choking noises, …

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Categories Sleep Blog

What Causes Sleep Apnea? Risk Factors You Can And Cannot Change

October 23, 2026October 21, 2026 by Shakeel Muzaffar
Illustration for What Causes Sleep Apnea? Risk Factors You Can and Cannot Change: a quiet moonlit bedroom with two pillows and a low lamp

Quick Answer: Sleep apnea is usually caused by something blocking the airway during sleep. NHLBI says obstructive sleep apnea happens …

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Categories Sleep Blog

School Start Times And Teen Sleep: What Studies Show

October 26, 2026October 20, 2026 by Shakeel Muzaffar
Illustration for School Start Times and Teen Sleep: What the Evidence Shows: a teen bedroom at early dawn with a backpack and books

Quick Answer: Later school start times help teens sleep more. Studies that moved start times 25 to 60 minutes later …

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Categories Sleep Blog

4-Month Sleep Regression: Signs, Causes And Safe Sleep Tips

October 27, 2026October 20, 2026 by Shakeel Muzaffar
Illustration for 4 Month Sleep Regression: Signs, Causes and Safe Ways to Cope: a dawn nursery with a bare bassinet, folded sleep sack and lamp

Quick Answer: The “4-month sleep regression” is a popular name, not a medical diagnosis. What the research supports is that …

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Categories Sleep Blog

When Do Babies Sleep Through The Night? What Research Shows

October 21, 2026October 20, 2026 by Shakeel Muzaffar
Illustration for When Do Babies Sleep Through the Night? What Research Shows: a quiet nursery with a bare crib, nightlight and rocking chair

There is no single age when all babies sleep through the night, and many healthy babies still wake at 12 …

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Categories Sleep Blog

When To See A Sleep Specialist: Signs, Visits And What To Bring

October 21, 2026October 20, 2026 by Shakeel Muzaffar
Illustration for When to See a Sleep Specialist: Signs, Visits and What to Bring: a calm clinic corner with armchairs, notebook and morning light

See a sleep specialist when sleep problems keep happening, do not improve with better habits, or hurt your days. The …

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Categories Sleep Blog

How To Read Sleep Study Results: AHI, Oxygen And Sleep Stages

October 21, 2026October 20, 2026 by Shakeel Muzaffar
Illustration for How to Read Sleep Study Results: AHI, Oxygen and Sleep Stages: a desk with a wave-line chart, reading glasses and tea

To read sleep study results, start with the AHI, then check oxygen, sleep stages and arousals. The apnea-hypopnea index (AHI) …

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Categories Sleep Blog

How To Get Used To CPAP: Mask, Dryness And Comfort Tips

October 26, 2026October 20, 2026 by Shakeel Muzaffar
Illustration for How to Get Used to CPAP: Tips for Mask, Dryness and Comfort: a bedside table with a quiet air machine, hose and folded mask

Quick Answer: Getting used to CPAP takes time and patience. The NHLBI says side effects are usually minor and fixable, …

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Categories Sleep Blog

Sleep And Dementia Risk: What The Research Shows

October 28, 2026October 20, 2026 by Shakeel Muzaffar
Illustration for Sleep and Dementia Risk: Does Poor Sleep Cause Dementia?: reading glasses, notebook and tea at dusk by a window

Quick Answer: People who sleep 6 hours or less in midlife, and people with sleep problems, have a higher risk …

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Categories Sleep Blog

What Happens During A Sleep Study? A Night-By-Night Walkthrough

October 21, 2026October 20, 2026 by Shakeel Muzaffar
Illustration for What Happens During a Sleep Study? A Night-by-Night Walkthrough: a calm private bedroom with dim lamp and moonlit curtain

In a sleep study, you spend the night at a sleep center while sensors record your sleep. You arrive in …

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Categories Sleep Blog
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