Sleep regularity → next-day energy

Why this pairing is worth asking

Regularity is a property of a schedule rather than of any single night, which makes it the one hypothesis here that a short window genuinely cannot answer. Two people sleeping the same total hours can differ entirely in consistency. Weekends are usually the largest source of variation, so a fortnight containing only one weekend gives regularity very little to vary against.

What you would log

Bed/wake timing plus next-day energy.

How long to look

Several weeks are preferable because regularity is a repeated schedule property.

What could explain it instead

Shift work, weekends, travel, childcare, illness, and device non-wear.

Name these before looking, not after. The protocol covers the rules every question shares — fixed definitions, both signals in the intended time order, and “unclear” as a valid answer.

How to read the result

Read this as a description of your schedule, not a target. Consistency is easier to compare across weeks than within them, and a result that holds over one unusual month is not yet a pattern.

Evidence class: External research treats regularity as a distinct dimension; intervention evidence is still developing. Sleep regularity as an important component of sleep hygiene: a systematic review

Other sleep questions

• Sleep duration → next-day mood — On nights with more recorded sleep, was next-day mood usually different?
• Bedtime → morning readiness — Did earlier or later recorded bedtimes coincide with different morning readiness?

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