Sleep Blog: Practical Guides for Better Rest
Practical sleep guides, calculator how-tos and evidence-informed tips.
Calculator guides
Bedtime Calculator: How to Find Your Best Bedtime
Learn how a bedtime calculator works, what to enter and how to choose between results. Includes a bedtime table for common wake-up times.
Read guide →Calculator guidesCircadian Rhythm Calculator: Find Your Body Clock
What a circadian rhythm calculator and chronotype quiz can tell you, how to find your mid-sleep time, and how to plan a schedule that fits your body clock.
Read guide →Calculator guidesJet Lag Calculator: Plan Your Sleep Across Time Zones
How to use a jet lag calculator to plan sleep before, during and after a flight. Includes rules of thumb for adjustment time and light timing tips.
Read guide →Calculator guidesNap Calculator: How Long to Nap and When to Wake
Use a nap calculator to pick the right nap length and alarm time. Includes a nap table, the best time to nap and how to avoid grogginess.
Read guide →Calculator guidesSleep Cycle Calculator: How the 90-Minute Math Works
How a sleep cycle calculator and REM sleep calculator work, why 90 minutes is only an average, and how to use cycle counts to plan your night.
Read guide →Calculator guidesSleep Debt Calculator: How to Calculate and Repay It
Learn how to calculate sleep debt with a simple weekly formula, see a worked example and get a realistic plan to repay it without wrecking your schedule.
Read guide →Calculator guidesSleep Duration Calculator: How Many Hours Did You Sleep?
Work out how many hours you slept between bedtime and wake-up time, the difference between time in bed and time asleep, and how to calculate sleep efficiency.
Read guide →Calculator guidesWake-Up Time Calculator: When Should You Wake Up?
How a wake-up time calculator works, with examples for bedtimes from 10 PM to midnight. Learn how to pick an alarm time and avoid groggy mornings.
Read guide →Schedules & bedtimes
Best Sleep Schedule: How to Build One and Fix a Broken One
Build a sleep schedule you can keep: choose a wake-up time, calculate bedtime, set a wind-down routine and reset a broken schedule step by step.
Read guide →Schedules & bedtimesWhat Time Should I Go to Bed? Best Bedtime by Wake-Up Time
Wondering what time you should go to bed? Count back from your wake-up time. See bedtimes for common alarms, by age, and how to adjust.
Read guide →Schedules & bedtimesHow Much Sleep Do I Need? Hours by Age and How to Tell
Recommended sleep hours for every age from newborns to older adults, plus practical ways to work out how much sleep you personally need.
Read guide →Schedules & bedtimesSleep Calculator Guide: How Sleep Time Calculating Works
Learn how sleep calculators estimate bedtimes and wake-up times, how sleep cycles fit in, and how to use the results sensibly.
Read guide →Schedules & bedtimesSleep Schedule by Age: Bedtime and Wake-Up Planning
Use recommended sleep duration by age to plan realistic bedtimes and wake-up times for children, teens, adults, and older adults.
Read guide →Schedules & bedtimesTeen Sleep Schedule: Why Teens Sleep Later and How to Help
Understand why teen sleep timing shifts later and how families can build a practical sleep schedule around school and daily life.
Read guide →Sleep science
Chronotypes Explained: Why Some People Sleep Earlier or Later
Learn what chronotypes are, why sleep timing differs between people, and how to build a schedule around your natural tendencies.
Read guide →Sleep scienceWhy Do We Dream? What Sleep Research Can Tell Us
Explore what researchers know about dreams, REM sleep, memory, emotion, and why dream science still has open questions.
Read guide →Sleep scienceSleep Cycles Explained: Stages, Length and How to Use Them
How sleep cycles work: light sleep, deep sleep and REM, how long a cycle lasts, why it varies, and how to use cycles sensibly when planning bedtime.
Read guide →Sleep scienceSleep Stages Explained: NREM, Deep Sleep, and REM
A clear guide to N1, N2, N3 deep sleep and REM sleep, and how sleep stages and cycles change through a typical night.
Read guide →Habits & environment
Alcohol and Sleep: Why Feeling Sleepy Isn't Sleeping Well
Learn how alcohol can change sleep quality, nighttime waking, breathing, and the way you feel the next morning.
Read guide →Habits & environmentHow to Set Up a Better Bedroom for Sleep
A practical bedroom setup guide covering light, sound, temperature, bedding, clutter, and nighttime distractions.
Read guide →Habits & environmentWhat Is the Best Sleep Position?
Compare side, back, and stomach sleeping positions and learn how to choose a comfortable position for your body.
Read guide →Habits & environmentBlue Light and Sleep: What Screens Can Do at Night
Learn how evening light affects sleep timing, why screen use can delay bedtime, and which practical changes can help.
Read guide →Habits & environmentCaffeine and Sleep: How Long Before Bed Should You Stop?
Learn how caffeine can affect sleep, why the cutoff time varies, and how to choose a practical caffeine schedule.
Read guide →Habits & environmentHow Exercise Affects Sleep: Timing, Intensity, and Recovery
See how regular exercise can support better sleep, how workout timing may affect your bedtime, and simple ways to fit activity into your routine.
Read guide →Habits & environmentHow to Fall Asleep Faster: 12 Evidence-Based Strategies
Evidence-based ways to fall asleep faster: caffeine timing, a wind-down routine, a warm shower, the leave-the-bed rule and when to seek help.
Read guide →Habits & environmentMelatonin and Sleep: What It Is and How Timing Matters
Understand what melatonin does in the body, how light affects it, and why supplement timing should not replace good sleep habits.
Read guide →Habits & environmentNapping Guide: How Long, When, and How to Nap Well
How long to nap, the best time of day, why some naps leave you groggy, and who should avoid napping. Includes a nap length table and tips for a short power nap.
Read guide →Habits & environmentSleep Hygiene Guide: Better Sleep Habits + 7-Day Plan
Learn what sleep hygiene means, which habits matter most, and how to build a bedtime that fits your life, with a simple 7-day reset plan.
Read guide →Habits & environmentBest Bedroom Temperature for Sleep: How Cool Is Comfortable?
Learn how bedroom temperature can affect sleep comfort and how to create a cooler, more comfortable sleep environment.
Read guide →Health & problems
How Much Sleep Do Children Need? A Practical Age Guide
A clear guide to recommended sleep duration for babies, toddlers, children, and teens, with practical schedule tips.
Read guide →Health & problemsHow to Fix Sleep Debt: A Practical Recovery Plan
Learn what sleep debt is, how to calculate it, and how to recover from missed sleep and rebuild a stable sleep routine without wrecking your schedule.
Read guide →Health & problemsWhy You Can’t Sleep: Common Causes and Practical Steps
Explore common reasons people struggle to fall asleep or stay asleep, practical habits that may help, and when it is time to talk to a doctor.
Read guide →Health & problemsSleep and Aging: How Sleep Changes as You Get Older
Learn how sleep patterns change with age, what is normal for older adults, and which habits can support better sleep in later adulthood.
Read guide →Health & problemsSleep and Anxiety: How Worry Can Keep You Awake
Learn how anxiety and nighttime worry can interfere with sleep and which simple routines may help you wind down.
Read guide →Health & problemsSleep and Mental Health: Why Rest Supports Well-Being
Learn how sleep and mental well-being affect each other and when ongoing sleep problems deserve professional support.
Read guide →Health & problemsSleep and Weight: Why Sleep Matters for Healthy Habits
Understand how sleep affects appetite, energy, activity, and the daily habits that support healthy weight management.
Read guide →Health & problemsSleep Apnea: Warning Signs and When to Get Help
Learn common sleep apnea warning signs, why they can disrupt sleep, and when to speak with a healthcare professional.
Read guide →Health & problemsSleep Deprivation: What Happens When You Miss Sleep
Understand short-term and long-term effects of insufficient sleep and why consistent sleep opportunity matters.
Read guide →Health & problemsWhy Can’t I Sleep? Common Causes and What to Do
Explore common causes of difficulty falling or staying asleep and learn practical steps to improve your nighttime routine.
Read guide →Travel, work & tools
How to Recover From Jet Lag: A Practical Sleep Plan
Use light, sleep timing, short naps and a gradual routine to adjust to a new time zone after travel. Practical steps for eastward and westward trips.
Read guide →Travel, work & toolsShift Work and Sleep: How to Build a Safer Routine
Practical shift-work sleep strategies for night workers, rotating schedules, light exposure, naps, and consistent routines.
Read guide →Travel, work & toolsCommon Sleep Myths: What Is True and What Is Not?
Clear up common sleep myths about needing eight hours, sleep cycles, alcohol, naps and catch-up sleep, with what the evidence actually says.
Read guide →Travel, work & toolsDo Sleep Trackers Work? What Wearables Can Tell You
Learn what sleep trackers estimate, where their data can help, and why consumer sleep stages are not clinical measurements.
Read guide →Ready to find your sleep time?
Plan a bedtime or wake-up time in under a minute with our free sleep calculator.