Evening Exercise and Sleep: Does Training Late Hurt? | GRIT.
Vol. 04Performance

Train Late, Sleep Well

GritxLabsEditorial Team
4 min read Evidence-based · 6 studies cited

For most people in Indian cities, the only free hour to train is after work. The old advice says that ruins your sleep. The research says that for most sessions it doesn't, as long as you get a few details right.

Quick answer

Evening exercise does not generally harm sleep in healthy adults. A meta-analysis found sleep was mostly unchanged, and slightly deeper, after evening exercise. The exception is vigorous exercise that ends less than about an hour before bed. Finish hard sessions early, skip late caffeine, and wind down.

23Studies pooled in the evening-exercise meta-analysis
1 hBuffer to leave after hard sessions before bed
6+ hGap between caffeine and bedtime
7–9 hRecommended nightly sleep for adults
Read the deep dive ↓

Does working out at night ruin your sleep?

The rule "never exercise in the evening" comes from a sensible idea: exercise raises your heart rate, body temperature and alertness, and all three need to fall before you can fall asleep. So it feels logical that a late session would keep you up.

When researchers actually tested it, the picture was different. Across many sleep-lab studies, healthy people who exercised in the evening generally slept just as well as on rest days, and spent slightly more time in deep sleep.

A systematic review and meta-analysis of 23 studies found that evening exercise did not disrupt sleep in healthy adults, and was linked to slightly more deep (slow-wave) sleep. The one exception: vigorous exercise ending less than about one hour before bedtime, which was linked to taking longer to fall asleep and less efficient sleep.

Source: Stutz J, Eiholzer R, Spengler CM (2019). Sports Medicine.
What the research found
23 studies
Usually fine
Evening exercise didn't disrupt sleep
Slightly more deep sleep
Easy sessions late are fine
but
The exception
Hard + late
Vigorous exercise ending under ~1 h before bed
Took longer to fall asleep
Less efficient sleep
Source: Stutz J, Eiholzer R, Spengler CM (2019). Sports Medicine.
GRIT.
It's not the evening that's the problem. It's training hard right before bed.

When does a late session hurt sleep?

The problem is not the evening, it is the gap. A very hard session, like intervals, heavy leg day or a fast football game, that ends right before you lie down leaves your heart rate and core temperature high. Your body needs time to come back down.

Leaving around an hour between the end of a hard session and bedtime takes care of most of it. Easy sessions, like a walk, mobility work, yoga or light technique, are much less of a problem.

It's not the evening that steals your sleep. It's having no gap before bed.

GritxLabs Editorial Team

Often it's not the workout at all

When people say evening training wrecks their sleep, the workout is often not the real cause. Three things tend to come along with late sessions:

  • Late caffeine. A pre-workout scoop at 7 p.m. can still be in your system at midnight. A controlled study found caffeine six hours before bed cut more than an hour of sleep. See Caffeine and Sleep.
  • Bright gym lights and screens. Light-emitting screens before bed delayed melatonin and made people sleepier the next morning.
  • Going straight to bed wired. No shower, no wind-down, phone in hand.
The usual sleep thieves
Late caffeineA 7 p.m. pre-workout can still be in you at midnight.
Bright screensLight-emitting screens delay melatonin.
Bed while wiredNo wind-down between the session and the pillow.
Source: Drake C et al. (2013); Chang AM et al. (2015).
GRIT.
Often the workout isn't the real cause.

An evening training plan that protects sleep

Pick the intensityBefore you start
Hard intervals or heavy lifting early in the evening; easier sessions later.
No late caffeine6+ hours before bed
Skip the pre-workout for late sessions, or keep caffeine small and early.
Finish with a gap~1 h before bed
End hard sessions at least an hour before you plan to sleep.
Wind downAfter training
Cool shower, light snack, dim lights, phone away.
Same bedtimeEvery night
Your body clock likes routine more than it minds an evening session.
An evening that protects sleep
6–8 p.m.
TrainHardest work earlier in the evening.
No pre-workout
Skip late caffeineOr keep it small and early.
After training
Wind downCool shower, light snack, dim lights.
1+ h after hard work
SleepSame bedtime every night.
Source: Stutz J et al. (2019); Drake C et al. (2013); Hirshkowitz M et al. (2015).
GRIT.
Leave a gap, drop late caffeine, and wind down.

The upside of moving your body

Regular exercise is one of the most reliable ways to sleep better overall. A meta-analytic review found that both single sessions and regular training had small-to-moderate benefits for sleep, including total sleep time and sleep quality.

So if evening is the only time you can train, train. Getting the session in matters far more than avoiding the time of day. For why that sleep matters so much, read Sleep Is Your Best Recovery Tool.

What we are working on

A good night after a late session is exactly what we are designing GRIT. Sleep for: an effervescent tablet you drop in water before bed. It is still in development, so we will share the full formula and the research behind it at launch. No added sugar and 100% vegetarian, like every GRIT. product.

What this means for you

  • Evening training is fine for most people's sleep.
  • Leave about an hour between a hard session and bed.
  • Drop late caffeine and bright screens; they do more damage than the workout.
  • Wind down with a shower, food and low light.

Frequently asked questions

Is it bad to work out at night?

Not for most healthy adults. Research shows evening exercise generally doesn't harm sleep, and can slightly increase deep sleep. Very hard sessions ending less than about an hour before bed are the exception.

How long before bed should I stop exercising?

Aim to finish hard sessions at least about an hour before bedtime. Light activity such as walking, yoga or stretching can be closer to bed.

Why can't I sleep after an evening workout?

Common causes are a very intense session too close to bed, caffeine from a pre-workout, bright lights and screens, or going straight to bed without winding down.

Is evening exercise better than no exercise for sleep?

Yes. Regular exercise improves sleep overall, so training in the evening is far better than skipping it.

References

  1. Stutz J, Eiholzer R, Spengler CM (2019). Effects of evening exercise on sleep in healthy participants: a systematic review and meta-analysis. Sports Medicine, 49(2), 269–287.
  2. Kredlow MA et al. (2015). The effects of physical activity on sleep: a meta-analytic review. Journal of Behavioral Medicine, 38(3), 427–449.
  3. Drake C et al. (2013). Caffeine effects on sleep taken 0, 3, or 6 hours before going to bed. Journal of Clinical Sleep Medicine, 9(11), 1195–1200.
  4. Chang AM et al. (2015). Evening use of light-emitting eReaders negatively affects sleep, circadian timing, and next-morning alertness. PNAS, 112(4), 1232–1237.
  5. Hirshkowitz M et al. (2015). National Sleep Foundation's sleep time duration recommendations: methodology and results summary. Sleep Health, 1(1), 40–43.
  6. Halson SL (2014). Sleep in elite athletes and nutritional interventions to enhance sleep. Sports Medicine, 44(Suppl 1), S13–S23.

This article is for general education and is not medical advice. Talk to a doctor or registered dietitian before changing your diet or supplements, especially if you are pregnant, nursing, under 18, taking medication or have a health condition.

Written byGritxLabs Editorial Team
Keep reading
Vol. 09 · RecoverySleep Is Your Best Recovery Tool: What the Science SaysRead →Vol. 10 · RecoveryCaffeine and Sleep: How to Train Hard and Still Sleep WellRead →Vol. 02 · PerformanceWhen to Take Caffeine Before a Workout: The Timing GuideRead →