In women approaching or in menopause, higher calcium intake is linked to a lower chance of sleeping too little or too much, but this effect is not seen in post-menopausal women, indicating a possible hormonal interaction.
Evidence from Studies
No evidence studies found yet.
What Would Prove This
Per GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this claim, ordered from strongest to weakest.
A systematic review of RCTs could determine whether calcium supplementation reduces abnormal sleep duration specifically in pre- and peri-menopausal women.
A systematic review and meta-analysis of RCTs comparing calcium supplementation (1000 mg/day) versus placebo in pre- and peri-menopausal women (aged 35–55) with self-reported short or long sleep, measuring changes in sleep duration via actigraphy over 12 weeks, stratified by estrogen levels.
An RCT could determine whether calcium supplementation reduces short or long sleep duration specifically in pre- and peri-menopausal women.
A double-blind RCT with 120 pre- and peri-menopausal women (aged 35–55) with actigraphy-confirmed short (<6h) or long (>9h) sleep duration, randomized to 1000 mg/day calcium carbonate or placebo for 12 weeks, with primary outcome: change in mean sleep duration, secondary outcomes: serum calcium, vitamin D, and estradiol levels.
A prospective cohort could determine whether calcium intake predicts transition into abnormal sleep duration specifically in pre- and peri-menopausal women.
A prospective cohort of 3000 pre- and peri-menopausal women aged 35–55 with baseline calcium intake measured by FFQ and sleep duration assessed annually via actigraphy for 5 years, analyzing whether low calcium intake predicts transition into short or long sleep categories, adjusting for hormone replacement therapy and BMI.
Cross-sectional studies can identify the association between calcium intake and abnormal sleep duration in pre- and peri-menopausal women at a single time point.
A nationally representative cross-sectional survey of 5000 pre- and peri-menopausal women using 24-hour dietary recalls and actigraphy to classify sleep duration, adjusting for menopausal status, hormone levels, and BMI.
A case-control study could compare past calcium intake in pre- and peri-menopausal women with chronic short or long sleep versus normal sleepers.
A case-control study comparing 150 pre- and peri-menopausal women with chronic short (<6h) or long (>9h) sleep to 150 matched controls with normal sleep (7–8h), using validated dietary recall for calcium intake over the prior 12 months, adjusting for hormone use and psychiatric history.