Sleep Debt Tracker – Track Your Weekly Sleep Shortfall
Sleep debt tracker
Log a night by duration or by clock times, then watch the shortfall across a seven day range. Everything stays in this browser. One entry per date, keyed by the morning you woke up.
Log a night
A night that began late Monday and ended Tuesday morning belongs to Tuesday.
Age wins while it is filled in. Clear it and your picked band takes over again.
Clock times run 00:00 to 23:59. If wake is not after bedtime, the night is treated as crossing midnight. Identical times are rejected. Clock times measure time in bed, so use Duration when you were awake for a long stretch.
Weekly snapshot
The ring and the number in the middle measure the same nights: the fill is sleep against target on the nights you logged, the centre is what those nights fell short by. A day you skipped counts for nothing either way.
Night by night
History
| Date | Slept | Target | Difference | Note |
|---|
How the number is worked out
Shortfall for one night is your target minus the sleep you logged. Target 8h, slept 6h 45m, shortfall 1h 15m. Sleep 8h 20m against the same target and the shortfall is 0h 00m, never a negative number, so a long night cannot cancel a short one.
The weekly figures add up the nights you logged inside the range printed under the ring, and nothing else. Skip Wednesday and Wednesday is left out rather than scored as a full night's gap. That keeps a patchy week honest instead of dramatic.
Related reads
- Sleep quality score tool, for the nights when the duration looks fine and you still wake up flat.
- You slept 8 hours, so why are you still exhausted? Covers timing, fragmentation and the things duration alone misses.
What sleep debt means here
People say sleep debt when they mean the gap between the sleep they planned on and the sleep they got. This tracker keeps that idea plain by calling it shortfall and building it only from numbers you type in. Nothing is measured. Nothing is inferred from a wrist sensor.
The reason to track a week rather than a night: one late Tuesday reads very differently from five short nights in a row, and only one of those is a pattern you can act on.
Why the total ignores days you skipped
Counting an unlogged day as zero sleep would put 8 hours of fake shortfall on the board for every day you forgot. Counting it as a perfect night would hide real gaps. So a missing day is simply absent, and the line under the ring tells you how many of the seven nights the total is built from. Three of seven logged is a hint. Six of seven is a picture.
Why the weekly total sometimes will not move
Every weekly figure covers a seven day range. Save a night from six weeks ago and it lands in the history table with an "outside range" flag, while the ring, the stats and the bars stay put. That is arithmetic, not a broken calculator.
Two fixes. Pick a date inside the range printed under the ring, or set the range to end on your latest logged night, which is the setting to use while you backfill an old week.
How much sleep adults need
Adults are commonly advised to aim for seven hours or more, often described as a seven to nine hour range, with teenagers needing more. The NHLBI guide to sleep duration by age sets out the bands this tracker suggests. Your own number can sit outside them, which is why a target you type is kept as typed.
Why a run of short nights matters more than one bad night
Short sleep across days is linked at population level with changes in alertness, mood and daytime performance, and the NHLBI overview of sleep deprivation and deficiency also ties it to safety at work and on the road. None of that tells you your personal risk. What the tracker can tell you is whether your shortfall streak keeps growing.
Can one long night clear the total?
No. A night at or above target adds zero and subtracts nothing, so the weekly total only eases as short nights drop out of the range. Research on weekend catch-up sleep points the same direction: the NIH summary of recovery sleep research found a long weekend did not undo the metabolic cost of repeated short nights.
Naps have a narrower job. CDC and NIOSH guidance on napping treats them as short term support for alertness, which is why shift workers use them and why they do not stand in for a full night.
The 10-3-2-1-0 rule, and what it is worth
The mnemonic goes: no caffeine 10 hours before bed, no food at 3, no work at 2, no screens at 1, zero snoozes in the morning. It has never been tested as a single protocol and the exact hours will not suit everyone. Treat it as a prompt.
If you only move one piece, move the caffeine. An afternoon coffee can still be active at bedtime, the change costs nothing, and the bars above will show you within a week whether it did anything for you.
When to stop tracking and talk to a doctor
Loud snoring with breathing pauses, sleepiness that follows you through the day, or sleep problems that keep affecting work and mood are all reasons to see a clinician rather than a chart. Drowsy driving belongs in that list too: NHTSA guidance on drowsy driving is blunt that enough sleep is the only reliable fix, not coffee and an open window.
This tracker is for education and self tracking. It estimates a shortfall from what you type, does not measure sleep stages, and does not diagnose anything.
Common questions
How is sleep debt calculated?
Your shortfall for one night is your target minus the sleep you logged. Meet or beat the target and that night reads 0h 00m, never a negative number. The weekly figure adds up only the nights you logged inside the seven day range printed under the ring, and a day you never logged is left out rather than counted as a full night's gap. If your entries are older than that range, set the range to end on your latest logged night and they start counting.
Why did the weekly total not change when I saved a night?
Every weekly figure covers a seven day range, so a night dated outside it changes nothing above. The entry is still saved, and the history table flags it as outside the range. Two ways to see it: pick a date inside the range printed under the ring, or switch the range to end on your latest logged night.
How much sleep do adults need?
Public health guidance for adults lands at seven hours or more a night, often described as a seven to nine hour range. Your own number can sit outside it, which is why you can type your own target instead of accepting the suggested one.
Does sleeping in on weekends repay sleep debt?
Not here, and not fully in the research either. A night at or above target adds zero to the weekly total and never cancels a short night you already logged, so the total only eases as short nights drop out of the seven day range. A long Saturday can take the edge off sleepiness without undoing a fortnight of short nights.
Is six hours of sleep enough?
For most adults six hours sits under the usual recommendation. You can feel fine on it for a stretch and still watch the weekly shortfall climb, which is the part this tracker puts in front of you.
How long does it take to recover from sleep loss?
There is no fixed exchange rate. One longer night can take the edge off a few short ones, while weeks of short sleep usually need weeks of normal sleep rather than a single big lie-in.
What is the difference between sleep debt and sleep deprivation?
Sleep deprivation describes not getting enough sleep. Sleep debt is the running gap that builds up while that keeps happening.
Do naps help with sleep debt?
A nap can cut daytime sleepiness, which is why shift workers use them, and it does not replace the length or structure of a full night. The tracker holds one entry per morning, so fold a nap into that total only if you want it counted.
How much sleep debt is too much?
No number here works as a diagnosis. Watch the direction instead: a weekly shortfall that keeps growing, below-target nights that stay frequent, or daytime sleepiness that is affecting your driving, work or mood. That last one is a reason to talk to a doctor rather than a tracker.
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