Stress & Sleep · Research-based
CBT-I Sleep Diary
The consensus sleep diary (Carney et al., Sleep 2012;35(2):287-302) is the prospective self-monitoring instrument every evidence-based insomnia treatment runs on. It is the first thing a CBT-I provider asks for and the input that drives sleep restriction therapy. The AASM 2021 CBT-I Clinical Practice Guideline names it a required protocol component. The diary takes about five minutes each morning, kept for a minimum of two weeks before any other CBT-I tool can be calibrated. Recall-based sleep estimates are notoriously inaccurate — the diary is what makes the math work.
Evidence basis
Carney CE, Buysse DJ, Ancoli-Israel S, et al. The consensus sleep diary: standardizing prospective sleep self-monitoring. Sleep 2012;35(2):287-302; Edinger JD, Arnedt JT, Bertisch SM et al. Behavioral and psychological treatments for chronic insomnia disorder in adults: an AASM clinical practice guideline. J Clin Sleep Med 2021;17(2):255-262; Morin CM, Espie CA. Insomnia: A Clinical Guide to Assessment and Treatment, Springer (2003)
Duration
5 min
Posture
Sitting
Difficulty
Beginner
Format
Journaling
Benefits
The practice
Step by step
- 01
Keep the diary at your bedside or on your phone — wherever you will see it within five minutes of waking. Fill it out in the morning, not throughout the night.
- 02
Record yesterday's date at the top of today's entry. The diary tracks the night that ended this morning.
- 03
Entry 1 — Bedtime: write the clock time you got into bed last night with the intention to sleep. Not the time you watched TV in bed; the time you turned off the lights to try to sleep.
- 04
Entry 2 — Time to fall asleep: estimate in minutes how long it took to fall asleep after lights-out. Round to the nearest five minutes — 'about 20' is fine; do not chase precision.
- 05
Entry 3 — Number of awakenings: count how many times you woke up during the night, not including the final wake-up. If you woke briefly and rolled over, that counts.
- 06
Entry 4 — Total time awake during the night: estimate in minutes how long you were awake during those middle-of-the-night awakenings combined. Again, round to five minutes.
- 07
Entry 5 — Final wake time: clock time you woke for the last time, even if you stayed in bed afterward.
- 08
Entry 6 — Time out of bed: clock time you actually got out of bed and started the day. The gap between final wake time and out-of-bed time is therapeutically important — staying in bed awake breaks the bed-sleep association.
- 09
Calculate Total Sleep Time (TST): (out-of-bed time − bedtime) − time-to-fall-asleep − total awake time − (out-of-bed time − final wake time). Most diaries just ask you to add up the sleep blocks; the simplest formula is 'time from falling asleep to final wake, minus middle-of-night awake time.' Write the result in hours and minutes.
- 10
Calculate Sleep Efficiency (SE): Total Sleep Time ÷ Time in Bed × 100. Time in bed is (out-of-bed time − bedtime). The result is a percentage. Healthy SE is ≥85%. Lower SE is the target Sleep Restriction Therapy works on.
- 11
Note one optional entry: anything unusual that may have affected sleep — late caffeine, alcohol, a stressful event, a medication change, illness. One short phrase is enough.
- 12
Keep the diary every morning for at least two weeks before drawing conclusions or starting sleep restriction. One bad night is noise; the trend is the signal. After two weeks, average your TST and SE to set the time-in-bed window for sleep restriction.
Modifications
Variations
Paper version: a small notebook by the bed with one row per day works as well as any app. The consensus diary template (free PDF from the American Academy of Sleep Medicine) gives you the exact column layout if you want it structured.
App version: any consensus-aligned app (CBT-i Coach from the US Veterans Health Administration is free and well-validated) automates the SE calculation. Use whichever medium you will actually fill in daily — adherence matters more than format.
Partner-reported version for people with cognitive impairment or memory difficulties: a bed partner can record bedtime, observed awakenings, and out-of-bed time. Subjective entries (time to fall asleep, total awake time) still come from the sleeper if at all possible.
Note
The sleep diary itself has no contraindications — it is observational, not interventional. For people with severe insomnia and high baseline anxiety about sleep, however, daily focused tracking can increase sleep-performance anxiety in the first week; if you notice this, set a rule that the diary is filled in once and not reviewed during the day, and bring the pattern to a CBT-I provider for support. People with bipolar disorder should keep a sleep diary, but should not use it to launch sleep restriction without psychiatric supervision — short sleep can precipitate mania. If suspected sleep apnea (loud snoring, witnessed pauses, daytime sleepiness despite adequate time in bed) is present, the diary alone will not surface it; pursue a sleep study in parallel.
Goes well with
Pairs with
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