Sleep Debt: Tracker and Log

CYDR LTD

About this app

Tired all the time and not sure why? Sleep Debt turns that vague feeling into a
number you can actually act on.

Log the time you went to bed and the time you woke up. Sleep Debt compares every
night against your own sleep goal and shows your running total: the hours of sleep
you still owe your body over the last 7 days.

WHY TRACK SLEEP DEBT
Missing 40 minutes on a Monday feels like nothing. Missing 40 minutes five nights
in a row is a different story. Sleep debt is simple math — your goal minus what you
really slept — and it adds up quietly. Once you can see the number, you know
whether tonight calls for an early bedtime or a long lie-in.

WHAT YOU GET
- Sleep debt at a glance — your rolling 7-day deficit or surplus, in hours and minutes
- Clear status: Sleep Surplus, Almost There, Sleep Debt or Critical Debt
- Weekly overview chart — seven nights against your goal line, so patterns jump out
- Fast sleep log — bedtime, wake time, duration calculated for you, past midnight included
- Sleep quality rating — one to five stars per night
- Analytics — average sleep, consistency, best night, worst night, average quality
- Your own sleep goal — anywhere from 5 to 10 hours
- Daily reminder at the time you choose, so you never forget to log
- Export your sleep data whenever you want
- Clear all data in one tap
- Dark theme designed for a dark bedroom
- No wearable, no ring, no watch needed — just your phone

PRIVACY BY DESIGN
No account. No sign-up. No ads. No advertising identifiers. No third-party
analytics. Your sleep log is stored on your device and stays there unless you
choose to export it. The app works fully offline.

WHO IT IS FOR
- Shift workers and night owls whose schedule is never the same twice
- Students catching up after late nights
- New parents tracking broken sleep
- Runners, lifters and anyone who treats recovery as part of training
- Anyone who wants a plain sleep diary without a subscription to a hardware ecosystem

HOW IT WORKS
1. Set your target sleep duration.
2. Log bedtime, wake time and how the night felt.
3. Watch your sleep debt build up or shrink over the week.
4. Pay it back with earlier nights until the number turns positive.

A SIMPLE SLEEP DIARY, NOT A SLEEP LAB
Sleep Debt is a manual sleep log. It does not use the microphone, does not listen
to you at night and does not guess your sleep stages. You enter the hours; the app
does the arithmetic and the charts. That is why it is fast, quiet and private.

IMPORTANT
Sleep Debt is a self-tracking and educational tool. It is not a medical device and
does not provide diagnosis or treatment. If you have ongoing problems with sleep,
please talk to a qualified healthcare professional.

Questions or ideas? Write to [e-mail] — we read everything.