Every output names at least one verified PubMed source.
Sleep regularity as an important component of sleep hygiene: a systematic review. PMID 41259946. PMID 41259946(verification gap: Journal name and author list were not captured in this run and must be filled from the PubMed record.) Systematic review (59 primary studies); narrative synthesis with best-evidence grading. · weight 1.0 · Greater day-to-day irregularity of bed and wake times is consistently associated with worse mental, metabolic, vascular and cognitive outcomes and higher all-cause mortality, independent of sleep duration.
Windred DP, Burns AC, Lane JM, et al. Sleep regularity is a stronger predictor of mortality risk than sleep duration: A prospective cohort study. Sleep. 2023;47(1):zsad253. PMID 37738616 Prospective cohort study using actigraphy-derived Sleep Regularity Index. · weight 0.5 · Higher sleep regularity was associated with substantially lower all-cause mortality, and was a stronger predictor than sleep duration in this cohort.
Limits: Target durations here are conventional ranges, not individual prescriptions, and the cited studies are about regularity rather than an optimal duration.
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