Estimate time in bed, sleep duration and efficiency from a sleep diary.
This tool handles overnight times and awake minutes. It is an educational estimator, not the PSQI or a diagnostic score.
This page estimates time in bed, time asleep and sleep efficiency from four diary entries. It is not the Pittsburgh Sleep Quality Index (PSQI) and does not return a clinical sleep-quality score. One recorded sleep period cannot establish whether you have a sleep disorder.
The PSQI is a separate University of Pittsburgh questionnaire covering the past month. Its full scoring method uses seven components; a four-field diary calculation cannot inherit its validation. University of Pittsburgh: PSQI
The genuine PSQI covers subjective sleep quality, sleep latency, sleep duration, habitual sleep efficiency, sleep disturbances, use of sleep medication and daytime dysfunction. Its components each contribute 0–3 points to a total of 0–21. This site's tool does not administer or score those components. Official PSQI description
| Topic | Included in this diary tool? | What is recorded here |
|---|---|---|
| Bed and wake times | Yes | Clock times for one period |
| Time to fall asleep | Yes | Your estimate in minutes |
| Awake time after sleep begins | Yes | Your estimate in minutes |
| Subjective quality | No | No quality rating is calculated |
| Medication use | No | No treatment recommendation is calculated |
| Daytime dysfunction | No | Discuss symptoms independently of the number |
Enter the time you went to bed and the time you got up, then estimate how many minutes you took to fall asleep and how many you were awake afterward. Use total awake minutes, not the number of awakenings. Missing details cannot be reconstructed by the arithmetic.
No PSQI score appears in this calculator's results. The diary does not assign severity bands to its four entries. Recording time asleep or time in bed is different from scoring the official questionnaire, and these entries should not be translated into a PSQI severity category.
The result cards describe time in bed, estimated sleep duration and estimated efficiency. They do not label sleep as excellent, restorative or impaired. A higher efficiency can follow from shorter time in bed without showing that you slept enough or felt well.
The original PSQI's published performance statistics apply to its studied instrument and population. They do not describe the accuracy of this site's diary, so sensitivity and specificity from that study cannot describe this diary or establish that its output identifies a sleep disorder. Use the official instrument's documentation if discussing an actual PSQI report. PSQI owner and scoring information
For this tool, time in bed is the elapsed interval between the two clock times, allowing a crossing of midnight. The supported period must be shorter than 24 hours. Identical bed and wake times are rejected rather than interpreted as a full day.
Estimated sleep = time in bed − minutes to fall asleep − minutes awake after falling asleep.
Estimated efficiency = estimated sleep ÷ time in bed × 100.
Worked arithmetic example: Bedtime 23:00 and wake time 07:00 give eight hours in bed. Fifteen minutes to fall asleep and 45 minutes awake afterward leave seven estimated hours asleep. Seven divided by eight is 87.5%. The calculation describes the entered record, not a clinical finding that the night was “normal.”
Awake minutes cannot be negative or exceed the time in bed. Check the entries if they do: the tool cannot determine which value is wrong. Daytime sleep and naps should be recorded as separate periods, not silently added to an overnight entry.
If inadequate sleep is affecting daily activities, talk to your doctor. NHLBI describes clinical assessment using sleep history, symptoms and sometimes tests. Keeping a diary for one to two weeks before the appointment may help; it can include naps, daytime sleepiness, caffeine, alcohol and exercise as well as bed and wake times. NHLBI insomnia diagnosis
Do not wait for a website score above 10 to seek help. Snoring with gasping, persistent difficulty sleeping or sleepiness that affects safety deserves discussion regardless of estimated efficiency. The diary cannot diagnose insomnia or sleep apnea and cannot rule them out. NHLBI lists loud snoring, gasping and daytime sleepiness among sleep-apnea symptoms and advises discussing symptoms with a healthcare provider. NHLBI sleep-apnea symptoms
NHLBI describes cognitive behavioral therapy for insomnia (CBT-I) as usually the first treatment for long-term insomnia. Treatment may include sleep restriction under an appropriate plan; this calculator does not tell you to shorten your time in bed whenever efficiency is below 85%. NHLBI treatment
You may also read the stress guide or anxiety information. These are separate topics; this page does not rank stress as the universal leading cause of poor sleep.
What is a good PSQI score?
This diary estimator does not produce a PSQI score. The University of Pittsburgh says higher PSQI scores indicate poorer sleep quality and a score above 5 suggests significant sleep difficulties. That statement refers to the actual monthly questionnaire, not the three result cards here. PSQI information
How accurate is the PSQI?
The PSQI has its own research and official documentation. This site's diary has not been independently validated as that instrument. Its arithmetic can be checked against the entered times, but the estimates depend on your recall and cannot measure sleep stages or establish a disorder.
How often should I retake the PSQI?
The genuine PSQI assesses the previous month; changing its timeframe does not preserve its validation. Follow the instrument's instructions and any clinical advice. For this separate diary, NHLBI suggests a one-to-two-week record may help before an appointment; there is no prescribed “retest score” interval here. PSQI timeframe; NHLBI diary guidance
Sources checked October 5, 2026. Keep symptoms and clinical advice separate from the arithmetic of a single recorded night.
How this page was researched
Written and maintained by Ash K, who is not a licensed medical professional. Read the method, source links and limitations on this page. A cited instrument or formula does not mean this website has independent clinical validation.
This is health information, not medical advice. It does not replace your doctor. Read our editorial process · Medical disclaimer
This tool is for informational and educational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult your healthcare provider with questions about your health.