What effect does regular exercise have on sleep quality?

• A. It generally decreases sleep duration
• B. It can improve sleep quality
• C. It makes falling asleep more difficult
• D. It has no significant impact on sleep

Answer: (B)

Regular exercise is associated with improved sleep quality for several reasons. Engaging in physical activity helps regulate the body's internal clock, facilitating the natural sleep-wake cycle. Exercise can increase the amount of time spent in deep sleep, which is the most restorative phase of the sleep cycle. Furthermore, regular physical activity can help reduce symptoms of anxiety and depression, which are often linked to sleep disturbances.

Additionally, exercising during the day can lead to increased energy expenditure, helping to create a natural need for rest and recovery, which supports a more profound and more restful sleep. By promoting relaxation and reducing stress levels through the release of endorphins, exercise also helps to prepare the body for sleep, making it easier to fall asleep and stay asleep throughout the night.

While other options suggest negative effects or no impact at all, they do not reflect the substantial body of research demonstrating that regular exercise contributes positively to sleep quality.