How Evening Exercise Mistakes Can Sabotage Your Sleep

Dr. Shelby Harris, a licensed clinical psychologist and behavioral sleep medicine specialist at BetterSleep, explains that evening workouts are not a one-size-fits-all solution for better rest. A recent study of four million nights of sleep showed that higher-intensity exercise pushes sleep onset later, shortens total sleep time and fragments deep sleep stages. Activities that keep the heart rate elevated and breathing heavy for 30 to 60 minutes after the session can prevent the body from cooling down, making it harder to wind down.

Harris recommends scheduling vigorous sessions at least two hours before bedtime and opting for low-intensity movement—such as restorative yoga, stretching, light Pilates or an easy walk—when exercising later in the day. She also highlights that many pre-workout supplements contain caffeine and other stimulants like synephrine, yohimbine or large amounts of green-tea extract, which may linger in the system and interfere with sleep.

Reading labels carefully and avoiding these ingredients after dusk can improve sleep quality. Moderate aerobic activities performed earlier, such as brisk walking, cycling, swimming or jogging, are consistently associated with deeper, more restorative sleep.