Figure 3. Trend in average sleep duration across increasing physical activity groups. The most dramatic decline occurs between the low-activity and moderate-activity cohorts — a drop of nearly two hours — consistent with the time-displacement hypothesis: as exercise commitment grows, sleep is the first resource sacrificed from the daily schedule.
Source: Preventive Medicine and Lifestyle Reports, Autumn 2023, pp. 88–102. [fabricated for educational purposes]

Activity Group	Avg Sleep Duration
Low (<40 min/day)	8.43 hrs
Moderate (40–59 min/day)	6.57 hrs