Bulletin of experimental biology and medicineJul 27, 2026

Melatonin Strength, Not Timing, Is Linked to Sleep Quality in the Arctic

Circadian Biology Weekly Brief ↗PubMed ↗DOI ↗

Updated Aug 3, 2026

Abstract

A significant positive association was found between melatonin amplitude and sleep efficiency (β = 0.317, p < 0.037).

No significant seasonal variations in sleep efficiency were observed among Arctic residents (p > 0.05).
Melatonin amplitude is positively associated with sleep efficiency, suggesting it may influence sleep quality.
Melatonin phase parameters did not show a significant relationship with sleep efficiency (p > 0.3).
Findings indicate that enhancing melatonin amplitude could be a potential strategy for improving sleep quality.

Simplified

This study investigated the relationship between the amplitude and phase of melatonin rhythm and sleep efficiency in 15 Arctic residents, accounting for the pronounced seasonal variations in the photic environment. Sleep efficiency was assessed using actigraphy across the winter and summer solstices, and the spring equinox. Analysis revealed no significant seasonal variations in sleep efficiency (p > 0.05). Multiple regression analysis, after adjusting for photoperiod, demonstrated a significant positive association between the melatonin amplitude and sleep efficiency (β = 0.317, p < 0.037, η² = 0.10). Melatonin phase parameters (acrophase or dim light melatonin onset (DLMO)) had no significant relationship with sleep efficiency (p > 0.3). These findings suggest that melatonin amplitude plays a dominant role in determining sleep quality, and substantiate the potential efficacy of interventions aimed at augmenting melatonin rhythm amplitude.

Full Text

Full text is available at the source.

View Full Text ↗

Melatonin Strength, Not Timing, Is Linked to Sleep Quality in the Arctic

Abstract

Full Text

You found one interesting study. We’ll send the next 7.

What Lands in Your Inbox Each Week:

Recent issues from the circadian biology brief