A sleep diary: record timing and how the next day felt

Separate time in bed from perceived sleep

Record when you went to bed, when you believe you fell asleep and when you got up. Those are not necessarily the same observations. If you know only when you turned off the light, write that instead of inventing a sleep-onset time. An honest estimate remains useful. Keep dates clear when a night crosses midnight, particularly during shift work or travel, so later entries are understandable without reconstructing the schedule.

Observe quality and daytime function

CDC identifies quantity and quality as components of healthy sleep and recommends discussing difficulties with a professional. Note remembered awakenings and how you felt on waking. Also consider daytime sleepiness and its effect on familiar activities. A personal rating can make comparison easier but cannot replace an assessment. If sleepiness compromises safety, do not wait for a lengthy sequence of entries before seeking appropriate advice about the difficulty you are experiencing.

Include context that supports questions

The NIH NHLBI sleep diary includes habits, medicines, caffeinated or alcoholic drinks and daytime sleepiness. Record relevant times without automatically concluding that one item caused a poor night. A coincidence over a few days may raise a question, but it cannot prove a relationship. Keep medicine instructions intact and avoid changing times or stopping products solely because you noticed a pattern in a diary that has not been professionally assessed.

A morning and daytime template

Imagine a person whose sleeping hours vary because they work shifts. A dated summary with context is more useful than a generic note saying “irregular sleep.”

This structure makes different days understandable even when the routine cannot follow the same clock times.

• On waking: bedtime, estimated sleep onset, remembered awakenings and time of getting up.
• During the day: naps, perceived sleepiness and difficulty with activities.
• Context: work, travel, activity, relevant drinks and medicines, with known times.
• Uncertain information marked as approximate without pursuing false precision.
• One appointment question, such as persistent difficulty falling asleep or waking refreshed.

Choose a review that does not disrupt rest

Completing the diary after waking may be more manageable than repeatedly checking the clock during the night. Agree on an observation period when your team requests one, and bring the summary with its limitations. Device data, when available, should be identified as that device’s estimates. A diary cannot diagnose apnea or another sleep disorder. Persistent difficulty, awakenings with concerning symptoms or significant daytime effects deserve individualized assessment rather than a diary-generated treatment decision.

Compare days with different demands

A night before an early shift and a night before a day off may offer different opportunities for rest. Mark those conditions rather than interpreting every variation as a product-related problem. If you want to try a routine change, discuss its purpose and keep the record descriptive. Do not add several supplements to “improve the graph.” Bring persistent difficulties and their daytime effects to your team, preserving the personal experience alongside the clock times that only partly describe it.