Dear Colleagues:

Sleep is a fundamental biological process essential for maintaining physical, psychological, and cognitive health. Adequate sleep supports immune functioning, metabolic regulation, cardiovascular health, memory consolidation, and emotional balance. In contrast, sleep disturbances and chronic sleep deprivation are associated with increased risk of depression, anxiety, cardiometabolic disorders, impaired decision-making, and reduced quality of life. Sleep difficulties may also negatively influence health behaviors, including treatment adherence, physical activity, and dietary regulation.

Emerging research highlights the complex and bidirectional relationship between sleep and health. Biological mechanisms such as circadian rhythms, hormonal activity, and inflammatory responses interact with psychological factors, including stress, coping strategies, and emotion regulation. Social and environmental determinants—such as work demands, digital media exposure, and socioeconomic conditions—further shape sleep patterns and related health outcomes.

Despite substantial progress in sleep research, important gaps remain in understanding how sleep influences health across different populations, developmental stages, and clinical conditions, as well as how sleep-related perceptions affect health-related decisions and behaviors.

This Special Issue welcomes original research, systematic reviews, and case reports that examine the mechanisms linking sleep and health and evaluate interventions to improve sleep and promote long-term well-being.