Group 1 - A study from the University of Surrey indicates that insufficient sleep for seven consecutive days, with less than six hours per night, leads to changes in over 700 genes, affecting the body's chemical balance and immune function [1] - Sleep deprivation increases the risk of metabolic diseases, cancer, and mental health issues, highlighting the long-term health consequences of poor sleep habits [1] - Research from the University of California shows that individuals who sleep well exhibit less aggressive behavior, while lack of sleep diminishes self-control and increases impulsivity [1] Group 2 - The University of Pennsylvania's research reveals that excessive fatigue hinders protein synthesis in the hippocampus, which is crucial for memory, learning, and emotional regulation [1] - Sleep deprivation negatively impacts athletic performance by weakening neural function, leading to poor reaction times and increased risk of injury during physical activities [1] Group 3 - Insufficient sleep causes extreme fatigue in the ciliary muscle, affecting eye movement control [2] - Increased secretion of ghrelin due to lack of sleep leads to cravings for high-fat and sugary foods, while also reducing levels of leptin, the hormone responsible for signaling satiety [2] - Short sleep duration is associated with a higher likelihood of obesity, as the body seeks food to maintain alertness, ultimately slowing metabolism [2] Group 4 - Sleep deprivation impairs higher-level information processing, making problem-solving, time management, and decision-making more challenging [2] - The immune system is weakened by lack of sleep, increasing susceptibility to respiratory and gastrointestinal illnesses [2] Group 5 - Insufficient sleep results in higher water loss from the epidermis, leading to noticeable skin aging [3] - Daytime drowsiness is a common consequence of sleep deprivation, indicating the body's need for rest, which can be particularly dangerous while driving [3]