Sleep and circadian differences between light and heavy adult alcohol drinkers

This study compares sleep and circadian rhythms in heavy and light alcohol drinkers. Heavy drinkers reported more eveningness and exhibited shorter intervals between melatonin onset and sleep midpoint, suggesting circadian misalignment. They also had reduced circadian photoreceptor responsiveness, potentially impairing light-based circadian regulation. Despite sleeping slightly more, heavy drinkers displayed traits linked to impulsivity and alcohol use. These findings underscore the role of alcohol in disrupting sleep-circadian systems, which could exacerbate health and cognitive risks.

Reducing alcohol consumption can help restore circadian alignment and improve light-based sleep regulation. Consistent sleep routines and exposure to natural light may further support circadian health. These recommendations stem from observational data showing circadian disruption in heavy drinkers, but longitudinal or intervention studies are needed to establish causality and refine advice for individuals with differing alcohol habits.