Sleep Diary: Track Your Nights to Spot Patterns and Measure Sleep Efficiency
A sleep diary records your estimated sleep and daily habits to help identify patterns. Use this free tracker to prepare for a conversation about insomnia or other sleep concerns.
Reviewed by Michael Callans, MSW 
About this tool
A sleep diary is a daily record of estimated sleep times, awakenings, sleep quality, and habits that may affect rest. It helps you describe recurring sleep problems more clearly when memory of difficult nights feels blurred. By recording details each morning, you build a picture you can review with a clinician. The entries remain personal estimates, rather than exact measurements of sleep stages or proof of a sleep disorder.
Clinicians rely on sleep diaries too. In cognitive behavioral therapy for insomnia (CBT-I), the recommended first-line treatment for chronic insomnia, the diary is the working document. It is used to calculate sleep efficiency (the percentage of time in bed that you are actually asleep) and to set and adjust a sleep window over time. A doctor assessing sleep problems will also learn far more from one to two weeks of diary entries than from a single appointment. Sleep efficiency is only part of that assessment: total sleep, daytime functioning, medical history, and safety also matter.
Keep it quick and honest. Fill it in once each morning based on your best estimate, and resist the urge to clock-watch during the night, which only increases arousal. After a week or two, look back for patterns: a late caffeine that costs you sleep, weekend lie-ins that shift your clock, or how alcohol affects the night. Those patterns are where the useful changes start.
The research behind structured diaries includes the Consensus Sleep Diary developed by Colleen Carney and colleagues. Their paper describes expert agreement and patient feedback used to standardize sleep self-monitoring across research and clinical settings. This page is a simplified tracker informed by that approach, rather than the complete research diary. The American Academy of Sleep Medicine guideline by Edinger and colleagues supports multicomponent CBT-I for chronic insomnia. Keeping a diary helps inform care; diary completion alone is not equivalent to receiving CBT-I.
A diary is different from a wearable sleep tracker. A diary records your estimate of sleep and how rested you felt, while a wearable produces device-generated estimates. Neither should be treated as a diagnosis. If their accounts differ, note the difference for a clinician instead of changing your entries to match the device. The practical question is how your sleep pattern relates to your symptoms and daytime functioning, including difficulty staying awake.
If two weeks of entries show consistently low sleep efficiency, long time to fall asleep, or frequent awakenings, that pattern, not any single bad night, is what is worth bringing to a professional. A therapist trained in CBT-I can turn the diary into a specific sleep window and a plan for adjusting it, and the Psychology.com therapist directory is a free way to find one. A doctor is also the right call if the diary points to signs of a physical sleep disorder rather than insomnia alone, such as loud snoring or breathing pauses.
Use the notes field to clarify what the main columns cannot show. Record whether bedtime means getting into bed or trying to sleep, and whether wake time means your final awakening or getting out of bed. Those moments can differ. A clinician calculating sleep efficiency may need both sets of times, along with estimated awake time. Keep naps separate from the main sleep period and mark missed entries rather than reconstructing them with false precision.
Review repeated patterns as questions to explore. A difficult night after caffeine does not prove caffeine caused it; stress, illness, work schedules, or a changed routine may also matter. If you work overnight, record your main daytime sleep period consistently and note your shift. Bring the diary to care even if it is incomplete, and seek help sooner if sleepiness makes driving or work unsafe.
The Sleep Hygiene Checklist and Bedtime Routine Planner can help you consider habits alongside your entries. The Coping Skills Library offers broader self-help exercises, and the Insomnia Test can help you reflect on symptoms without diagnosing them. If you explore the Sleep Restriction Worksheet, discuss suitability with a qualified clinician before changing your sleep window. Trying to improve a percentage by cutting time in bed can leave important health and safety concerns unaddressed.
References
- Carney CE, et al. The consensus sleep diary: standardizing prospective sleep self-monitoring. Sleep. 2012;35(2):287-302.
- Edinger JD, et al. Behavioral and psychological treatments for chronic insomnia disorder in adults: an American Academy of Sleep Medicine clinical practice guideline. J Clin Sleep Med. 2021;17(2):255-262.
- National Heart, Lung, and Blood Institute. Insomnia: Diagnosis. https://www.nhlbi.nih.gov/health/insomnia/diagnosis
- Carney CE, et al. The consensus sleep diary: standardizing prospective sleep self-monitoring. Sleep. 2012;35(2):287-302. Full text: https://drcolleencarney.com/wp-content/uploads/2013/05/CSD.pdf
- Edinger JD, et al. Behavioral and psychological treatments for chronic insomnia disorder in adults. Full text: https://pmc.ncbi.nlm.nih.gov/articles/PMC7853203/
Cite this source
Psychology.com. (2026, September 16). Sleep Diary. Psychology.com. https://psychology.com/tools/sleep-diary
Sleep Diary FAQ
How do I use a sleep diary?
Each morning, log your bedtime, wake time, estimated hours slept, number of awakenings, and a quality rating, plus notes on caffeine, stress, or naps. After one to two weeks, review it for patterns. Keep naps in the notes and distinguish the time you woke up from the time you got out of bed. Estimates are useful; exact clock readings are unnecessary.
What is sleep efficiency?
Sleep efficiency is the percentage of time in bed that you estimate you were asleep. Divide estimated sleep time by time in bed and multiply by 100, using the same units. A clinician interprets this alongside sleep duration and daytime functioning. A high percentage alone does not mean you are getting enough sleep, and a low percentage does not diagnose insomnia.
Should I check the clock during the night?
No. Clock-watching tends to increase anxiety and arousal, making sleep harder. Fill in the diary once in the morning using your best estimate. If you cannot remember an awakening clearly, use an approximate entry and move on. The purpose is to describe a pattern for discussion, so a precise timestamp is less useful than a sustainable morning routine.
Is my data saved anywhere?
No. The tracker runs in your browser and nothing is uploaded. The PDF is created on your own device.
How many nights should I track before it means anything?
The National Heart, Lung, and Blood Institute suggests keeping a sleep diary for one to two weeks before seeing a doctor. That gives you entries to discuss across different days and routines. Patterns can suggest questions about habits or scheduling, but they do not prove a cause. Do not delay care to finish the diary if sleep loss or daytime sleepiness is affecting safety.
Is a sleep diary better than a sleep tracker app?
A sleep diary and a sleep tracker app provide different kinds of information. The diary captures your estimates and experience, including how rested you feel and what happened during the day. An app or wearable may add device-generated estimates. Bring useful information from either to a clinician, and avoid treating a device score as a diagnosis or a reason to distrust your experience.