Melatonin affects sleep outcomes in research

The Claim

Melatonin affects sleep outcomes in research

This conclusion is most relevant to: Adults (see study for details).

What the Research Shows

The conclusion draws on 6 linked studyies. Highlights from the cited literature:

• ▸Mechanisms of Heat-Induced Sleep Disruption in Aging: A Narrative Review. (Clocks & sleep, 2026) — This narrative review synthesizes evidence that elevated nighttime temperatures disrupt sleep in older adults through multiple mechanisms, including prolonged sleep onset, fragmentation of slow-wave and REM sleep, and suppression of melatonin secretion. Age-related declines in thermoregulatory capacity, such as reduced sweating and impaired vasodilation, exacerbate these effects. The review notes that sex-related differences, particularly menopause-associated vasomotor instability in women and testosterone-related autonomic changes in men, further modulate individual vulnerability.
• ▸Prescription patterns of sleep medications for critically ill patients: A nationwide retrospective observational cohort study in Japan. (Australian critical care : official journal of the Confederation of Australian Critical Care Nurses, 2026) — Among 1,595,351 ICU patients, 30.8% received sleep medications during their ICU stay. Sleep medication use during ICU stay was strongly associated with sleep medication prescription at hospital discharge (odds ratio: 6.90; 95% CI: 6.59-7.23), with 47.0% of users versus 11.3% of nonusers receiving prescriptions at discharge.
• ▸Chronotype preference and circadian markers in children and adolescents with obsessive-compulsive disorder: A case-control study. (Sleep medicine, 2026) — In a case-control study of 29 children/adolescents with OCD and 30 matched controls, evening chronotype was significantly more common in the OCD group (p<0.05). Within the OCD group, those with evening chronotype had significantly lower CY-BOCS scores (p<0.05) and higher morning salivary melatonin levels (p<0.05), while cortisol did not differ.
• ▸Perioperative sleep management in cardiac surgery: an evidence-oriented narrative review of pharmacological, behavioral, and respiratory support strategies. (Frontiers in cardiovascular medicine, 2026) — The review indicates that melatonin and its receptor agonists can improve subjective sleep quality and help regulate circadian rhythms in patients undergoing cardiac surgery. However, their effects on key clinical outcomes such as postoperative delirium, length of hospital stay, and objective measures of sleep architecture remain inconsistent across studies.

How It Works

The proposed biological pathway:

• ▸melatonin
• ▸Biological pathway
• ▸Sleep regulation
• ▸Outcome improvement

Who Might Benefit

Evidence fit by population:

• ▸Adults (see study for details)

Recommended Dose

See study

Limitations & Caveats

Important context when interpreting this evidence:

• ▸Sample size may be limited
• ▸Single study — more research needed
• ▸Population specificity may limit generalizability

Frequently Asked Questions