# 40 - Sleep and Exercise Pt. 2

Physical activity profoundly influences sleep quality, particularly by enhancing deep non-REM sleep, which is essential for memory consolidation, immune function, and metabolic regulation. While older adults experience a 40% increase in deep sleep from modest daily activity, young adults require vigorous exercise—at or above 85% of their maximum heart rate—to achieve comparable gains. Consistent, long-term exercise regimens reliably improve sleep efficiency, total sleep duration, and the speed of falling asleep, without the diminishing returns often associated with other interventions. Although acute, intense exercise may cause a modest, temporary reduction in REM sleep, the overall impact remains overwhelmingly positive. Regular physical exertion serves as a sustainable, effective method for optimizing sleep architecture and subjective sleep quality across the lifespan, proving that consistent activity consistently yields restorative benefits.