A sleep diary is a simple record of when you sleep, when you wake, and what your days feel like. It can help you describe patterns to a healthcare professional without relying on memory or buying a sleep tracker. A few approximate notes each morning are enough to begin. [1–3]
QUICK INSIGHT
About Sleep Diary
Goal: Create a short record of your sleep and daytime patterns. You need: Paper and pen, a printable diary, or a basic digital note. Start here: Tomorrow morning, jot down when you went to bed, when you got up, roughly how long you slept, and how rested you feel. Limitation: Estimates are fine; a diary does not diagnose a sleep disorder. [1–3]
Before you begin
Choose a tool that you already have. A notebook or a note on your phone works. If you want a structured form, the National Heart, Lung, and Blood Institute (NHLBI) offers a free printable sleep diary. Keep private health notes somewhere you control, especially if using a shared device. [1]
Optional free template: NHLBI Sleep Diary
Try recording for one to two weeks if your aim is to prepare for a sleep appointment; a clinician may recommend a different duration. Do not set nighttime alarms or keep checking the clock to fill in the diary. [2]
How to keep your sleep diary: six steps
1. Record when you went to bed and got up.
In the morning, write approximate clock times. Distinguish getting into bed from getting up if that matters for your pattern.
2. Estimate sleep, not every minute.
Note roughly how long it took to fall asleep, whether you woke during the night, and your best estimate of total sleep. If you cannot remember, write ‘unsure.’
3. Add one daytime observation.
Use simple words such as rested, tired, sleepy, or alert. This adds context that total hours alone cannot provide.
4. Note possible influences.
Record naps, caffeine timing, alcohol if relevant, notable changes to medication, physical activity, or unusual stress. Do not change medicines to test a theory.
5. Repeat briefly each morning.
Use a simple routine—perhaps after breakfast. If you miss a day, leave it blank; do not reconstruct precise times from memory.
6. Review broad patterns, then share them.
After a week or two, look for recurring bedtime or wake-time patterns and daytime effects. Bring the diary to a clinician if sleep is affecting your life. Avoid treating one night as a diagnosis.
A copyable seven-day sleep diary
Fill one row each morning. Approximate values are fine. Add optional context in Notes. The sample row is fictional, for illustration only.
| Day / date | Bed → up | Sleep estimate | Daytime feeling | Notes |
| Example | 11:15 pm → 7:00 am | About 6.5 h | Tired | Woke twice; coffee after lunch |
| Day 1 | ||||
| Day 2 | ||||
| Day 3 | ||||
| Day 4 | ||||
| Day 5 | ||||
| Day 6 | ||||
| Day 7 |
If useful, write extra details below the table: time to fall asleep, nighttime waking, naps, and caffeine. You do not need exact measurements to notice a pattern.
Make it easier
Minimal version: Record only bedtime, morning rise time, and how you felt the next day. Paper version: Keep the table near your morning routine, not beside the clock overnight. Digital version: Use a private note without requiring a paid app. If tracking makes you more preoccupied or distressed, simplify it or stop and discuss the concern with a professional.
Check your result
You have a useful initial diary if most entries show approximate sleep timing, at least one daytime observation, and any obvious context you chose to track. Gaps do not make it worthless. Look for patterns across days rather than perfect numbers or an ideal score.
Common problems and easy fixes
Problem | What to try |
|---|---|
| I cannot remember when I fell asleep. | Write ‘unsure’ or a broad estimate. Do not watch the clock overnight. |
| My schedule changes. | Record actual times. Note shift work or unusual obligations in Notes. |
| I missed several days. | Restart with the next morning; avoid inventing entries. |
| The numbers make me anxious. | Reduce fields, stop tracking if necessary, and discuss the worry with a clinician. |
| My smartwatch disagrees. | Treat its readings as device estimates, not ground truth or a diagnosis. [4] |
What a diary can—and cannot—tell you
A diary can show self-reported sleep timing, habits, perceived restfulness, and changes worth discussing. NHLBI and CDC recommend sleep diaries as useful information during evaluation of sleep problems. The diary cannot by itself establish whether you have insomnia, sleep apnea, or another disorder. Consumer sleep devices have additional measurement limitations and are not substitutes for clinical evaluation. [1–4]
What to do next
If your notes show inconsistent routines, explore our Sleep & Rest: A Whole-Picture Guide.
If problems are persistent or daytime functioning is affected, learn when to seek professional help for sleep problems.
For ongoing insomnia questions, our chronic insomnia evidence guide explains why evaluation and appropriate treatment matter.
Seek prompt assessment for suspected breathing pauses or gasping during sleep or severe daytime sleepiness; do not drive when too sleepy to do so safely. Get urgent help for severe breathing difficulty or immediate danger.
Takeaway
A useful sleep diary is not a perfect log. A few consistent, approximate observations can make your sleep patterns easier to discuss and help you decide what to explore next.
References
1. NHLBI — Sleep Diary
https://www.nhlbi.nih.gov/resources/sleep-diary
2. NHLBI — Insomnia: Diagnosis
https://www.nhlbi.nih.gov/health/insomnia/diagnosis
3. CDC — About Sleep
https://www.cdc.gov/sleep/about/index.html
4. American Academy of Sleep Medicine — Consumer Sleep Technology Position Statement
https://pmc.ncbi.nlm.nih.gov/articles/PMC5940440/