Sleep deprivation is closely related to weight gain, primarily due to its impact on hormone regulation. A lack of sleep can disrupt the balance of hormones that control hunger and appetite, leading to increased cravings for high-calorie foods. Additionally, sleep-deprived individuals may experience reduced energy levels, making them less likely to engage in physical activity. Over time, these factors can contribute to weight gain and increase the risk of obesity and related health issues, emphasizing the importance of adequate sleep for maintaining a healthy weight.