What a useful diary includes
NHLBI suggests that a sleep diary kept for one to two weeks can help before an insomnia assessment. You can use its official printable sleep diary or copy the compact version below. If a clinician supplies a particular format, use that format so the observations match their questions.
Record when you attempted sleep separately from when you entered the bedroom to read. Distinguish final waking from getting out of bed. Add remembered periods awake, naps, caffeine, alcohol, exercise, and how sleepy you felt during the day. Mark uncertain times as approximate. An estimate is more honest than false precision.
A filled sleep diary entry
This is a hypothetical adult’s entry for teaching the format. It is not a case history, a normal-sleep target, or a recommended schedule. The dates and times simply make the arithmetic visible.
The entry includes both the night and a few relevant daytime observations. A single row cannot show whether any one habit caused a result. Repeated observations may help you identify questions to discuss.
| Field | Example entry |
|---|---|
| Started trying to sleep | 11:00 p.m. |
| Estimated time to fall asleep | 20 minutes |
| Remembered nighttime waking | Two periods, about 15 minutes total |
| Final waking / out of bed | 6:40 a.m. / 7:00 a.m. |
| Nap | About 20 minutes at 1:00 p.m. |
| Relevant drinks and activity | Coffee at 9:00 a.m.; no alcohol; afternoon walk |
| Morning and daytime note | Somewhat tired on waking; alert enough for usual tasks |
How the example’s estimated sleep is calculated
From 11:00 p.m. to 6:40 a.m. is 7 hours 40 minutes. Subtract the estimated 20 minutes before falling asleep and 15 minutes awake during the night. The result is about 7 hours 5 minutes of sleep. Time in bed until 7:00 a.m. is 8 hours, which is a separate measurement.
If you calculate sleep efficiency for this example, 425 minutes divided by 480 minutes is about 89%. That figure is descriptive arithmetic. It does not authorize reducing time in bed or copying someone else’s schedule. The guide to sleeping more efficiently explains why a ratio should not become an instruction to restrict sleep on your own.
A blank template you can copy
Make one copy for each night. Fill it once in the morning rather than repeatedly opening it while awake. Keep a separate short note about the day if that is easier than trying to remember everything at breakfast.
You can use paper or a private document. Include only detail that helps explain the pattern; a page of minute-by-minute commentary is unnecessary. If logging makes you more anxious, discuss a simpler approach with your clinician.
| Night and timing | Your estimate |
|---|---|
| Date of the night | |
| Tried to sleep / estimated time to fall asleep | |
| Remembered awakenings / total time awake | |
| Final waking / out of bed | |
| Naps: timing and approximate length | |
| Caffeine, alcohol, medicines or relevant symptoms | |
| Morning feeling / daytime sleepiness |
What to look for across several entries
Look for practical questions: is bedtime much later before days off, does a noisy household task repeatedly interrupt sleep, or do you leave little time for sleep before work? Write “worth discussing” beside a pattern instead of announcing a cause. A deadline, illness, or unusual event can change several habits at once.
The guide to anxiety the night before work is relevant when the same pre-work evening keeps appearing in your notes. If symptoms involve discomfort, use the more focused bed comfort checklist. Choose an adjustment that matches the observation rather than changing everything recorded.
Bring the diary to a useful conversation
If poor sleep interferes with daily activity, take the entries to a clinician along with your questions. Tell them about snoring, gasping, breathing pauses, pain, medicines, and substantial daytime sleepiness where relevant. A tracker’s staging graph can accompany the diary, but neither replaces an assessment.
Sleep Better, Step by Step offers a broader routine framework. For today, copy the blank fields, fill one morning entry, and leave any time you do not know clearly marked as an estimate.
Common questions
Do I need to look at the clock every time I wake?
No. Reasonable morning estimates are sufficient for a basic diary. Repeated clock checking can make the process burdensome.
Is time in bed the same as sleep duration?
No. Time before falling asleep, remembered waking, and time awake after final waking make the two totals different.
Should I shorten my night if efficiency is low?
Do not use this example to prescribe sleep restriction. Treatment decisions need appropriate individual guidance.