Physical activity improves sleep quality by promoting deeper and more restorative sleep stages. Engaging in regular exercise helps to regulate the body's circadian rhythms, making it easier to fall asleep and stay asleep throughout the night. Additionally, physical activity reduces symptoms of anxiety and stress, which are common barriers to good sleep. It also aids in controlling factors like weight and blood sugar levels that can disrupt sleep. Striking a balance in the timing and intensity of exercise is essential to optimizing sleep quality.