EFFECTS OF SLEEP ON HORMONAL REGULATION AND METABOLIC FUNCTIONS OF THE BODY

Educational Research in Universal Sciences ISSN: 2181-3515 VOLUME 4 | ISSUE 15 | 2025 https://t.me/Erus_uz Multidisciplinary Scientific Journal November, 2025 10 DOI: https://10.5281/zenodo.17779292 EFFECTS OF SLEEP ON HORMONAL REGULATION AND METABOLIC FUNCTIONS OF THE BODY Salimova Dildora Erkinovna assistant department of Endocrinology of Samarkand State Medical University Asad Shoaib student of faculty General medicine of Samarkand State Medical University ABSTRACT Despite the fundamental role of sleep in maintaining and improving physical and mental health, many people sleep less than the recommended number of hours or suffer from sleep disorders. Quality sleep contributes to the improvement of the state of the cardiovascular system, mental health, cognitive abilities, strengthening memory, immunity, reproductive health and hormonal regulation. Sleep disorders such as insomnia, sleep apnea, and circadian rhythm disorders, or sleep disturbances due to lifestyle choices, environmental conditions, or other medical problems, can lead to significant illnesses and can contribute to or exacerbate medical and mental health disorders. Recommendations for improving sleep include following a 7-9 hour sleep schedule, following a consistent sleep/wake schedule, a regular bedtime regimen, regular exercise, and meditative practice. In addition, avoiding many substances at the end of the day can help improve sleep. Caffeine, alcohol, abundant food, and prolonged exposure to light for days lead to partial and poor-quality sleep. Practicing good sleep hygiene can contribute to improving the quality and duration of sleep, with corresponding health benefits. Keywords: sleep, sleep hygiene, circadian rhythms, sleep stages, hormonal regulation, sleep duration, obesity, diabetes mellitus. Sleep is fundamental for optimal physical and mental health. Both the quantity and quality of sleep are essential for almost every system in the body, and suboptimal sleep affects the cardiovascular system, mental health, cognitive abilities, memory strengthening, immunity, reproductive health, and hormonal regulation. Despite this, many people do not achieve enough or quality sleep. In 2018, the American Academy of Sleep stated that 70% of people on Earth do not get enough sleep. Internal sleep Educational Research in Universal Sciences ISSN: 2181-3515 VOLUME 4 | ISSUE 15 | 2025 https://t.me/Erus_uz Multidisciplinary Scientific Journal November, 2025 11 disorders such as insomnia, sleep apnea, and circadian rhythm disorders, as well as poor sleep hygiene, can lead to significant illnesses that contribute to the onset or exacerbation of various medical and psychiatric conditions. In addition to treating concomitant In the case of internal sleep disorders, the best remedy for long-term sleep improvement is optimal sleep hygiene, defined as behavioral and lifestyle measures that can promote better sleep. This review presents the highlights of the basics of sleep physiology and its impact on core biological functions, examines common sleep disorders, and provides recommendations for optimal sleep hygiene. To start and maintain sleep, it is necessary to suppress the upward arousal systems that contribute to wakefulness. The level of extracellular adenosine increases during the entire waking period and an increase in its level signals the transition to sleep. Adenosine activates inhibitory neurons in the ventrolateral preoptic region of the brain and serves as a sleep switch. The circadian clock follows rhythms that are endogenously driven by physiological fluctuations and have a cycle duration of about 24 hours. The central circadian clock is called the suprachiasmatic nuclei and is located in the hypothalamus. Circadian rhythms affect behavioral and physiological functions such as eating, drinking, body temperature, neurohormone secretion, and sleep-wake patterns through feedback and molecular markers. These include exposure to light and darkness, as well as social cues. Light signals are perceived by the retina, which sends electrical impulses to the brain, indicating that it is daytime. Insufficient lighting is also perceived by the retina. In low-light conditions, the pineal gland secretes melatonin. Melatonin levels, often referred to as the "hormone of darkness," rise in the evening and peak in the early morning. It has a direct impact on the mechanism of sleep regulation. Similarly, levels of cortisol, another stimulating hormone, rise in response to exposure to light in the morning. A sharp restriction of sleep in an acute situation leads to the development of insulin resistance. Poor sleep in the form of short sleep, prolonged sleep, insomnia and breathing disorders during sleep are all associated with increased sleep Some hormones have a circadian rhythm and are altered due to poor sleep quality, irregular sleep schedules, and congenital sleep disorders. Growth hormone is also circadian in nature and is mainly produced during deep sleep. Disrupted sleep or a limited amount of deep sleep can affect muscle growth and repair. Sleep also affects the pituitary-gonadal system, and sleep disorders can lead to central suppression of testosterone production, manifesting as sexual dysfunction or decreased libido. When these hormones are unbalanced, a person’s hunger and appetite are often increased, as Educational Research in Universal Sciences ISSN: 2181-3515 VOLUME 4 | ISSUE 15 | 2025 https://t.me/Erus_uz Multidisciplinary Scientific Journal November, 2025 12 well as satiety is impaired, which increases the risk of obesity and diabetes. Poor sleep is also associated with an increased risk of an unhealthy diet, which in turn can lead to adverse health effects. A recent study has shown how this can happen on an experimental basis. Using a randomized controlled crossover analysis on 15 healthy people, it showed that during periods of sleep restriction, the subjects had a significant increase in daily energy intake, body weight, and visceral fat accumulation. CONCLUSION Sleep plays a fundamental role in maintaining physical and mental health, allowing the body to recover and grow. Quality sleep optimizes the functioning of almost all body systems, having an extremely important positive effect on the neurological, neurological, cardiovascular, immunological and endocrine systems. By eliminating potential sleep disorders such as insomnia and sleep apnea, as well as paying constant attention to sleep hygiene and lifestyle changes, it is possible to significantly improve health. 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