Sleep Pattern Analysis

A free sleep diary that turns your bedtimes and wake times into clear metrics and a trend chart — average sleep, consistency, social jet lag and sleep debt. No account, no app; your data stays in this browser.

Last reviewed by the SleepCycleFinder editorial team on 26 September 2026.
Private by design Nights you log are saved only in this browser's local storage. Nothing is sent to our servers.

Most adults need 7-9 hours. Used for the sleep debt figure and the chart's target line.

Your Sleep Diary

NightBedUpEst. sleepRested

Your Sleep Metrics

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Average estimated sleep
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Average bedtime
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Sleep timing consistency
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Social jet lag
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Sleep debt (last 7 nights)
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Sleep cycles per night

Sleep Trend: Last 14 Nights

Estimated sleep More than 1h under your need Your sleep need How rested (0-10, right axis)

What Your Pattern Suggests

    Want a better schedule to test?

    Pick a consistent wake-up time and let the calculator suggest bedtimes that fit whole 90-minute sleep cycles. Then log two weeks here and compare.

    Open the Bedtime Calculator

    How to Analyze Your Sleep Pattern

    You don't need a wearable to understand your sleep. Sleep clinicians routinely start with a simple sleep diary, because the most useful information — how long you sleep, when, and how regularly — is easy to record yourself.

    1. Log every night for 1-2 weeks. Write down when you went to bed, roughly how long it took to fall asleep, and when you got up. Fill it in each morning; memory fades quickly.
    2. Include your weekends. The gap between weekday and weekend sleep is often the most revealing part of the pattern.
    3. Rate how rested you feel. A 1-10 score each morning links the numbers to how you actually function.
    4. Look at averages and spread, not single nights. One bad night is normal. A pattern of short or irregular sleep is what matters.
    5. Change one thing at a time. Try a fixed wake time or an earlier bedtime for a week, keep logging, and compare.

    If you use a sleep tracker, you can type its bedtime and wake time into the diary too. For what those devices can and cannot measure, see our guide to sleep tracking technology.

    Sleep Metrics Explained

    MetricWhat it meansHow it's calculated here
    Estimated sleepHow long you were asleep. Most adults need 7-9 hours; teenagers and children need more.Time in bed minus the minutes it took to fall asleep. Night-time awakenings are not subtracted, so this is an upper estimate.
    Sleep timing consistencyHow much your sleep shifts from night to night. Research links irregular sleep timing with poorer mood, alertness and metabolic health, independent of duration.The typical deviation (standard deviation) of your sleep midpoint, in minutes. Under 30 minutes is very regular; over 60 minutes is irregular.
    Social jet lagThe shift between your sleep on work/school days and free days. Two hours of social jet lag is like flying two time zones west every Friday and back every Monday.Difference between your average sleep midpoint on Friday/Saturday nights and on other nights.
    Sleep debtHow much sleep you are missing compared with what you need. Accumulated debt shows up as daytime sleepiness and poorer concentration.Sum of (your sleep need − estimated sleep) over your last 7 logged nights. Nights with extra sleep offset shorter ones.
    Sleep cyclesSleep runs in cycles of light, deep and REM sleep, each roughly 90 minutes on average (actual cycles vary from about 70 to 120 minutes).Average estimated sleep divided by 90 minutes. Useful for planning wake times with the sleep cycle calculator.
    Time to fall asleepAlso called sleep latency. Around 10-20 minutes is typical. Regularly taking more than 30 minutes can be a sign of insomnia; falling asleep within a couple of minutes every night can signal sleep deprivation.Your own estimate for each night.

    Reading your sleep pattern graph

    In the trend chart, each bar is one night. Bars below the dashed line mean you slept less than your chosen need; lighter bars mark nights more than an hour short. The yellow line shows how rested you felt. Look for patterns such as short weeknights followed by long weekend lie-ins (a sign of sleep debt and social jet lag), or quality that stays low even on long nights, which is worth raising with a doctor.

    When a sleep diary isn't enough

    A diary shows patterns, not causes. Talk to a doctor if you regularly struggle to fall or stay asleep for more than three months, snore loudly or stop breathing during sleep, feel very sleepy during the day despite enough hours, or fall asleep at inappropriate times. Bring your exported diary: it's exactly the kind of record clinicians ask for. Useful next reads: sleep debt recovery, insomnia self-help, the sleep hygiene checklist and natural alarm clocks.

    Sleep Analysis FAQ

    How do I analyze my sleep pattern?

    Keep a sleep diary for at least one to two weeks, including weekends: note bedtime, wake time, roughly how long it took to fall asleep, and how rested you felt. Then look at four things: your average sleep duration, how much your timing varies night to night, the shift between weekdays and weekends (social jet lag), and how far you fall short of the sleep you need.

    What are the most important sleep metrics?

    For most people the most useful metrics are total sleep time, sleep regularity (how consistent your bedtime, wake time and sleep midpoint are), time taken to fall asleep, and how you feel during the day. Sleep-stage percentages from consumer trackers are less reliable than these basics.

    What is social jet lag?

    Social jet lag is the difference between the timing of your sleep on work or school days and on free days, usually measured as the shift in the midpoint of sleep. Sleeping two hours later at weekends is similar to crossing two time zones every week, which can make Monday mornings harder.

    How can I display my sleep data in a graph?

    This page draws a bar chart of your estimated sleep per night for the last 14 nights, with your target sleep need as a reference line and your quality ratings as a line. You can also export your diary as a CSV file and chart it in any spreadsheet app.

    Is my sleep diary data private?

    Yes. Everything you enter is stored only in your own browser using local storage. It is not sent to SleepCycleFinder or anyone else, and clearing your browser data or pressing Clear all deletes it.

    How accurate is this sleep analysis?

    The calculations are only as accurate as the times you enter. Estimated sleep is time in bed minus the time you think it took to fall asleep, so it does not account for night-time awakenings. It is designed to show patterns and trends, not to diagnose sleep disorders.