Source-based health education. Sources read 13 October 2026. No individual medical advice or claim of clinical review.
Separate observation from estimate
CDC includes a sleep diary in its discussion of sleep assessment. A useful personal record can distinguish when you got into bed from your estimate of when sleep began. The two fields need not be identical, and a remembered time should be labelled as an estimate.
Keep the record simple
Write the date, the observed clock times and any period you remember being awake. If a time is unknown, leave it unknown rather than calculate a precise sleep total from incomplete entries. The diary’s purpose is to communicate an experience, not to manufacture a measurement that was never made.
Discuss what the record can show
A professional may use such information alongside other assessment. A diary alone does not diagnose insomnia or establish that a routine caused a symptom. This guide describes record organisation and does not recommend changing medicines, using a device or delaying care.
Source and scope: Original public-agency guidance, read 13 October 2026. United States public-agency education. Practical worksheets and reading methods above are editorial interpretation, not a tested clinical tool.
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