A Review Article on Circadian Rhythm and Effects of Cannabinoids for Sleep-Wake Disorders

Sleep disorders, including circadian rhythm disruptions and sleep-wake cycle abnormalities, significantly impact mental and physical health. These conditions range from insomnia and delayed sleep-phase disorder to advanced sleep-phase disorder, non-24-hour sleep-wake rhythm disorder, and irregular sleep-wake rhythm disorder. The circadian rhythm, which is controlled by the hypothalamic master clock known as the suprachiasmatic nucleus (SCN), is at the heart of many sleep problems. The SCN synchronizes physiological and behavioral processes, such as hormone secretion and body temperature, aligning the body with the 24-hour day. Disruptions in this system, influenced by both internal and external factors, lead to a cascade of health issues, including neurodegenerative diseases, cognitive impairments, and psychological disturbances. Emerging research highlights the role of cannabinoids, particularly cannabidiol (CBD) and tetrahydrocannabinol (THC), in managing these disorders. These compounds interact with the endocannabinoid system, influencing sleep architecture, memory consolidation, and mood regulation. Cannabinoid-based therapies, such as nabilone and other synthetic analogs, have shown promise in treating sleep disorders, especially in alleviating symptoms of posttraumatic stress disorder (PTSD) and restless legs syndrome (RLS). This review delves into the physiological underpinnings of circadian and sleep-wake disorders and evaluates current treatments, including light therapy, melatonin supplementation, and cannabinoid-based interventions. Understanding the intricate balance between sleep, circadian rhythms, and emerging treatments can enhance therapeutic strategies, offering improved quality of life for those affected by these disorders.