Moving for Better Sleep: A Narrative Review of Exercise and Sleep Quality

Abstract

Objective: This narrative review aims to bridge the knowledge gap regarding the influence of exercise on sleep quality, exploring how various types, intensities, and timings of exercise impact sleep across different populations.

Materials and Methods: A systematic search for relevant literature was conducted in scholarly databases such as Google Scholar, PubMed, MEDLINE, SPORTDiscus, CINAHL, and Web of Science. The search included terms related to physical activity and sleep, focusing on studies published in English from the past 10 years (2014-2024). Studies involving human participants and employing randomized controlled trials (RCTs) or observational study designs were prioritized.

Results: Regular moderate-intensity aerobic exercise, such as brisk walking or cycling, significantly reduces sleep onset latency, improves sleep efficiency, and enhances subjective sleep quality across various populations. Potential mechanisms include stress hormone reduction, neurotransmitter regulation, and body temperature control. Emerging evidence suggests that resistance training can improve sleep onset latency and subjective sleep quality, particularly in older adults and individuals with chronic conditions. The benefits may be linked to muscle repair processes and stress reduction. The effects of High-Intensity Interval Training (HIIT) on sleep are mixed, with moderate-intensity programs showing potential benefits while excessive intensity or duration may disrupt sleep. Timing also plays a crucial role, with late-night HIIT potentially having negative impacts on sleep quality.

Conclusion: Regular exercise, especially moderate-intensity aerobic exercise, is a powerful tool for improving sleep quality. Resistance training also holds promise, particularly for specific populations. The impact of HIIT on sleep requires further research to determine optimal training parameters. Healthcare professionals should guide patients in tailoring exercise programs to optimize sleep benefits.