Physical fitness significantly influences sleep quality by promoting deeper, more restorative sleep cycles. Regular exercise can help reduce symptoms of insomnia, alleviate stress, and enhance overall relaxation. Aerobic activities are particularly beneficial, as they increase the body's internal temperature and promote the natural drop in temperature that occurs during sleep. Furthermore, exercise helps balance hormones like cortisol and melatonin, which are crucial for regulating sleep-wake patterns. By incorporating physical fitness into daily routines, individuals often experience improved sleep onset, duration, and overall quality.