How does exercise influence sleep?
Written by
Natalie Hamilton
Reviewed by
Prof. Benjamin Murphy, Ph.D.The timing of your exercise, whether early in the evening or later at night, can have a substantial impact on your quality of sleep by affecting your circadian rhythms and body temperature. Morning workouts tend to move your internal clock forward, enabling you to sleep earlier. Evening exercise nudges your internal clock back, but only temporarily. Increasing aerobic activity improves physical restoration during sleep by leading to a significantly longer duration of deep sleep.
Circadian Effects
- Morning light exposure during exercise advances sleep phase
- Evening workouts delay melatonin production temporarily
- Consistent timing stabilizes biological rhythms long-term
Thermal Regulation
- Elevated core temperature peaks 30-90 minutes post-exercise
- Cooling phase signals sleep readiness naturally
- Evening showers accelerate cooling when timed properly
Studies have shown that aerobic exercise, such as running and swimming, increases slow-wave sleep by 15 percent. This is the deep sleep stage, during which tissue repair occurs and human growth hormone is secreted. It is more important to exercise consistently than to do intense workouts occasionally; three weekly training sessions will yield greater results than an occasional intense workout.
A cool-down period of two hours after evening exercise is important so that your body temperature can drop 1 or 2 degrees before bedtime. Instead of taking a hot shower after evening exercise, take a lukewarm one so that your body temperature returns to normal. A lower body temperature signals the brain to release melatonin, which prepares the body for sleep.
Track your exercise and sleep patterns using a simple journal to stay on top of your routine. Write down when you exercised and how energized you felt the following day. Every week, start adjusting the timing until you find your own personal sweet spot. Each of us responds to exercise differently, based on fitness level and chronotype.
Read the full article: Sleep Science Explained: Essential Guide
