Source-based health education. Sources read 13 October 2026. No individual medical advice or claim of clinical review.
Identify the night consistently
An entry beginning before midnight and ending after it can be assigned ambiguously to two dates. For an editorial diary, choose a clear convention, such as the date on which the main sleep period began, and state it at the top.
Retain the complete timestamps
Record both dates when needed, especially if a travel or work schedule changes the usual pattern. A wake-up time should not appear to precede bedtime simply because its date was omitted. CDC’s diary discussion supports recording sleep habits; our date convention is a documentation choice, not a clinical rule.
Avoid false precision
If you are reconstructing a night from memory, mark estimated entries and missing intervals. Do not fill blanks to make a tidy weekly chart. A consistent record can help explain a question to a professional, but it cannot by itself establish a sleep disorder, a treatment effect or an exact sleep quantity.
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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