A sleep diary is a short record of your sleep and the circumstances around it. It can make “I have been sleeping badly” a more useful conversation. You can keep one on paper or in a private phone note; a wearable or paid subscription is optional.
What an official sleep diary records
NHLBI provides a free diary for sleep quantity and quality, daytime sleepiness, and use of medicines, alcohol and caffeinated drinks. It recommends bringing the record to your doctor. Our copyable prompts below are an original planning aid, not a validated diagnostic questionnaire. Download the official NHLBI sleep diary.
Copy these prompts
- Date and whether it was a workday, day off or travel day.
- Time I got into bed; approximate time I fell asleep.
- Awake periods I remember; final waking time; time I got up.
- Any naps and roughly when they happened.
- Caffeinated drinks, alcohol, medicines or supplements, with times where known.
- How sleepy I felt during the day, in my own words.
- Anything unusual: noise, a late shift, illness or a journey.
Fill it in without chasing perfect numbers
Choose one consistent place to keep the record. Complete the overnight section when you get up, while the night is reasonably fresh in your memory. Add daytime details when convenient. If you do not remember something, leave a gap or write “not sure.”
Do not repeatedly check the clock during the night just to make the form more detailed. A useful diary can contain approximations. Its purpose is to show your experience, not to grade the quality of your memory.
An example entry
Tuesday, early shift. In bed around 10:45 p.m.; asleep perhaps 11:15. Woke once, duration uncertain. Up at 6:30 a.m. Coffee at breakfast and lunch. Felt sleepy in the afternoon. Street noise seemed louder than usual.
This fictional entry separates observation from certainty. “Noise seemed louder” is useful context; “noise caused every waking” would be a stronger conclusion than the record supports.
Review the pattern, not one night
Look for differences between workdays and days off, or nights with a late commitment. Bring questions rather than a self-diagnosis: “Could my shift pattern matter?” or “Is this amount of daytime sleepiness something to investigate?”
Keep medication details private and share the diary only with people you intend. Do not change medicine doses to improve the record. If sleep problems persist or interfere with daily life, discuss them with a clinician rather than relying on a diary alone.
Related reading
- How Much Sleep Do Adults Need? Planning a Realistic Sleep Window
- Caffeine and Sleep: When Should You Stop Drinking Coffee?
- Explore all wellness guides
Prepared for Tranquilla Wellness with AI assistance. Sources checked September 13, 2026. General education; no independent clinical review is claimed. Read our editorial standards.
Featured photo: samira sadeqi / Unsplash.