I went for a run at 9 PM and couldn’t sleep. The next day I ran at 7 AM and slept well that night. The timing of exercise has a bigger impact on sleep than the exercise itself [1].
The Relationship Between Exercise Timing and Sleep
A meta-analysis by Stutz et al. (2019) found that vigorous exercise within 1 hour of bedtime increases sleep latency and reduces sleep quality [1]. Conversely, exercise more than 2 hours before bed significantly improves sleep quality.
Effects by Time of Day
Morning Exercise (6–9 AM)
The best time slot. Youngstedt et al. (2003) reported that morning exercise stabilizes circadian rhythms and improves nighttime sleep [2]. The effect is maximized when combined with morning sunlight exposure.
Afternoon Exercise (3–6 PM)
Core body temperature peaks at this time. Athletic performance is highest in this window, but the effect on sleep is neutral.
Evening Exercise (7–9 PM)
Moderate intensity is fine, but high intensity warrants caution. The rise in body temperature and cortisol release can interfere with falling asleep [3].
Realistic Exercise Timing for a Teacher
I run three times a week at 6:30 AM (30 minutes, Zone 2). I can finish before leaving for work, and the sleep benefits are excellent. I add one interval session on Saturday afternoon. Because I have ADHD, I need to exercise at the same time every day for the routine to stick.
References
- Stutz, J., et al. (2019). Effects of Evening Exercise on Sleep in Healthy Participants: A Systematic Review and Meta-Analysis. Sports Medicine, 49(2), 269-287.
- Youngstedt, S. D. (2003). Effects of Exercise on Sleep. Clinics in Sports Medicine, 24(2), 355-365.
- Oda, S., & Shirakawa, K. (2014). Sleep onset is disrupted following pre-sleep exercise. European Journal of Applied Physiology, 114(9), 1789-1799.
Disclaimer: This article is for educational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional before making health-related decisions.