The Crucial Link Between Sleep and Health

Introduction and Aim: Sleep is a fundamental physiological process that plays a critical role in immune regulation. It modulates both innate and adaptive immunity by influencing cytokine production, immune cell activity and inflammatory responses. Disruptions in sleep architecture have been associated with increased susceptibility to infection, enhanced systemic inflammation and the progression of chronic diseases. This review examines the mechanisms underlying the bidirectional relationship between sleep and immune function, highlighting the consequences of sleep disorders and potential therapeutic strategies. Materials and methods: A comprehensive analysis of articles available on PubMed and Google Scholar was undertaken by entering keywords in appropriate configuration: sleep/ disrupted sleep/ immune system/ inflammation/immune response. Current State of Knowledge: Adequate sleep, particularly slow-wave sleep (SWS), enhances immune function by promoting cytokine release and supporting the activity of natural killer (NK) cells and antigen-presenting cells. Chronic sleep deprivation disrupts this balance, leading to immune suppression, reduced vaccine efficacy and impaired immunological memory. Furthermore, persistent sleep disturbances contribute to the pathogenesis of autoimmune diseases, metabolic disorders, cardiovascular dysfunction and neurodegenerative conditions by promoting systemic inflammation, oxidative stress and circadian misalignment. Conclusions: Improving sleep quality through behavioural interventions, pharmacological treatments and anti-inflammatory therapies may enhance immune resilience and reduce disease risk. As the evidence linking sleep disturbance to immune dysfunction continues to grow, further research is needed to explore targeted therapeutic approaches that integrate sleep regulation as a key component of immune health.