Is it bad to exercise before bed? For most healthy adults, no. A 2019 review of 23 studies found evening exercise did not harm sleep overall and even slightly increased deep sleep. The main exception is vigorous exercise that ends within about an hour of bedtime, which may make it harder to fall asleep.
For years, the standard advice was to avoid evening workouts. Researchers have now tested that advice directly.
The 2019 review. Researchers at ETH Zurich pooled 23 studies of healthy adults who did a single evening exercise session or no exercise. Evening exercise slightly increased slow-wave (deep) sleep and slightly reduced the lightest stage of sleep. The authors wrote that the studies "do not support the hypothesis that evening exercise negatively affects sleep, in fact rather the opposite." Their caution: vigorous exercise ending 1 hour or less before bedtime might make it take longer to fall asleep and reduce total sleep time and sleep efficiency.
The 2021 review of hard workouts. A review of 15 studies with 194 healthy adults aged 18 to 50 who slept well looked at high-intensity evening exercise. Hard sessions ending 30 minutes to 4 hours before bed slightly reduced REM sleep but caused no other significant changes. The authors concluded that high-intensity exercise done 2 to 4 hours before bedtime does not disrupt sleep, and regular evening high-intensity training didn't either.
Johns Hopkins sleep experts say there is solid evidence that exercise helps you fall asleep more quickly and improves sleep quality. People who do at least 30 minutes of moderate aerobic exercise may notice better sleep that same night.
One caveat: these studies mostly involved healthy adults without sleep problems. If you have insomnia or another sleep condition, your experience may differ.
Johns Hopkins describes two effects. Aerobic exercise releases endorphins, which can leave some people feeling alert. It also raises your core body temperature. About 30 to 90 minutes later, your temperature starts to fall, which helps bring on sleepiness. That's why some people sleep best when they finish 1 to 2 hours before bed, while others notice no difference at all.
The 2019 review also hinted that a higher body temperature at bedtime went along with less efficient sleep. That finding was fragile, though. It disappeared when a single study was removed from the analysis.
Moderate exercise is generally fine in the evening. Moderate means you can talk but not sing. Brisk walking, water aerobics and cycling on level ground are examples.
Finish vigorous exercise at least an hour before bed. Vigorous means you can't say more than a few words without pausing for breath. Running, swimming laps and singles tennis are examples.
Give yourself more buffer if you need it. If hard evening sessions leave you wired, try finishing 2 hours or more before bed.
Test your own pattern. For two weeks, jot down your workout time, how hard it felt and how quickly you fell asleep. Your pattern matters more than a general rule.
Example: with a 10:30 p.m. bedtime, a hard interval session would ideally end by 9:30 p.m., or by 8:30 p.m. if late workouts keep you up. An easy walk or gentle stretching after dinner fits fine. This is only an example, so adjust it to your own schedule.
Cool down. Spend 5 to 10 minutes on easy movement and stretching so your breathing settles.
Cool off. Shower and give yourself time to cool down. CDC recommends keeping your bedroom quiet, relaxing and at a cool temperature.
Eat light. If you're hungry, have a small snack rather than a big meal. CDC advises avoiding large meals and alcohol before bed.
Check your caffeine. Look at the label on any pre-workout drink or energy product. CDC suggests avoiding caffeine in the afternoon and evening.
Put the screens away. Turn off electronic devices at least 30 minutes before bed.
Keep the same bedtime. Going to bed and getting up at the same time every day is one of CDC's core sleep tips, workout or not.
This is general information, not medical advice. Talk to your doctor or pharmacist about your own situation. CDC advises talking to a healthcare provider if you regularly have problems sleeping or notice signs of a sleep disorder. If you have a heart condition or another health problem, ask your doctor what kind and timing of exercise is safe for you. Stop exercising and get medical help right away if you have chest pain, feel faint or are severely short of breath.
For vigorous workouts, aim to finish at least an hour before bed. If exercise leaves you energized, Johns Hopkins suggests at least 1 to 2 hours. Moderate activity is generally fine closer to bedtime.
Gentle yoga and stretching are low intensity. The research concern is mainly about vigorous exercise close to bedtime, so a calm stretch fits easily into a wind-down routine.
Research doesn't show that evening exercise harms sleep for most healthy adults. Pick the time you can stick with, and move hard sessions earlier if they keep you up.
Johns Hopkins says there is solid evidence that exercise helps you fall asleep faster and improves sleep quality, and the benefit generally doesn't take months to show up.
If evening workouts leave you buzzing, Sleepward: Bedtime Routine can give the rest of your night some shape. It offers a four-minute evening reset, a protected block of personal time called Your Hour that ends before your chosen bedtime, and a gradually darkening wind-down screen with white, pink and brown noise and a sleep timer. It's free with optional Pro purchases, needs no account, has no ads, and keeps your notes on your device.
Get Sleepward free on the App Store