We’ve all had one of those nights.

You go to bed late, wake up several times, or simply don’t get enough sleep. The next morning, your brain feels slow, your concentration disappears, and even simple tasks seem harder than usual.

So what should you do?

Take a nap — or get up and exercise?

A recent study from researchers at McGill University makes this question particularly interesting. Researchers found that after sleep deprivation, both a short workout and a longer nap may help protect memory performance compared with simply staying awake and doing neither.

But that doesn’t necessarily mean naps and exercise affect your body in exactly the same way.

So if you had a terrible night of sleep, which one should you choose?

Let’s compare them.

Quick Comparison

	Workout	Nap
Best For	Energy, alertness, mood	Sleepiness and recovery
Time Needed	Around 20–30 minutes	20–90 minutes
Immediate Energy	Usually higher	Can vary after waking
Memory Support	May help after sleep loss	May help after sleep loss
Physical Benefits	Yes	Limited
Risk of Grogginess	Low	Possible
Best Time	Morning or daytime	Earlier afternoon
Replaces Nighttime Sleep?	No	No
Our Pick	Best for daytime performance	Best when truly exhausted

What Did the New Study Find?

Researchers at McGill University recently examined whether exercise or napping could help the brain after insufficient sleep.

Participants experienced sleep deprivation and were then assigned different recovery strategies.

Some exercised for approximately 20 minutes.

Others took a 90-minute nap.

Another group simply remained awake.

The interesting result was that participants who exercised or napped performed better on a memory task than those who did neither. McGill reported an improvement of roughly 22% for the exercise and nap conditions compared with the control condition.

That doesn’t mean exercise completely reverses sleep deprivation.

And it doesn’t mean a nap can replace a healthy night of sleep.

But it suggests something useful:

When you’ve already lost sleep, doing something may be better for your brain than simply pushing through the fatigue.

Alertness: Workout Wins

When you’re tired, exercise may be the last thing you feel like doing.

Ironically, it can also be one of the quickest ways to feel more awake.

Physical activity increases heart rate and circulation and can temporarily increase alertness.

You don’t necessarily need a brutal workout either.

A brisk walk, stationary bike session, light jog, or moderate workout may be enough to make you feel considerably more awake.

A nap works differently.

You’re actually returning to sleep.

That can be extremely effective when you’re genuinely sleepy, but there’s a downside:

sleep inertia.

That’s the groggy, disoriented feeling some people experience immediately after waking.

If you have an important meeting in 10 minutes, waking from a deep nap may not be ideal.

For immediate alertness, exercise has the advantage.

Winner: Workout

Memory: Surprisingly Close

This is where the recent research becomes particularly interesting.

Sleep plays an important role in memory.

So you might naturally expect a nap to easily beat exercise after a poor night’s sleep.

But the McGill findings suggest the answer isn’t quite that simple.

Both exercise and napping were associated with better memory performance compared with remaining awake without either intervention.

Researchers are still working to understand exactly why.

Exercise is already associated with changes in brain activity and blood flow that may support cognitive function.

Sleep, meanwhile, plays a direct role in memory processing and consolidation.

The mechanisms may be different, but both approaches appear potentially useful.

Based on the available evidence, we wouldn’t declare a clear winner here.

Winner: Tie

Energy: Workout Wins

There’s an important distinction between sleepiness and low energy.

If your eyes are closing and you’re struggling to stay awake, your body may genuinely need sleep.

But sometimes after a poor night, you aren’t falling asleep.

You simply feel sluggish.

That’s where exercise can work particularly well.

Even a relatively short workout can create a noticeable shift in how awake and energetic you feel.

There’s also another advantage.

After exercising, you can immediately return to your day.

With a nap, you need somewhere appropriate to sleep, enough time to fall asleep, the nap itself, and potentially some additional time to fully wake up.

For a busy workday, exercise is often more practical.

Winner: Workout

Physical Recovery: Nap Wins

Now imagine a different situation.

You slept four or five hours.

You already trained hard yesterday.

Your body feels heavy.

Your eyes are struggling to stay open.

Forcing yourself through another intense workout probably isn’t the smartest solution.

This is where a nap becomes more appealing.

Sleep supports physical and neurological recovery, and additional rest may be more valuable than adding another physical stressor when you’re severely fatigued.

The key is listening to what kind of tiredness you’re experiencing.

Mental sluggishness?

Movement may help.

Overwhelming sleepiness and physical exhaustion?

Rest may be the better choice.

Winner: Nap

Mood: Workout Has an Advantage

Poor sleep doesn’t just make you tired.

It can also make you irritable.

Everything seems slightly more annoying after a terrible night.

Exercise has a strong practical advantage here because physical activity can improve mood while simultaneously increasing alertness.

You don’t need to chase a personal record.

Even walking outside can combine several useful factors:

Movement.

Fresh air.

Daylight.

A change of environment.

That combination can make a surprisingly large difference during a tired morning.

A nap may also improve mood if sleepiness is the underlying problem.

But exercise is usually the more immediate mood reset.

Winner: Workout

Convenience: Workout Wins — Usually

This might sound strange.

Surely sleeping is easier than exercising?

At home, perhaps.

At work, not necessarily.

Most people can walk for 20 minutes during lunch.

Far fewer can disappear for a 90-minute nap.

And even when you have time to nap, you can’t guarantee you’ll actually fall asleep.

Exercise doesn’t have that problem.

Put on your shoes and start moving.

For most normal workdays, that’s considerably easier to control.

Winner: Workout

But What About a 20-Minute Power Nap?

This changes the comparison.

The McGill study used a longer nap, but in everyday life many people prefer shorter naps.

A brief 10–20 minute power nap may help improve alertness while reducing the chance of waking during deeper sleep and feeling groggy.

That makes short naps particularly useful during the afternoon.

There’s an important tradeoff, however.

A short power nap and a longer recovery nap aren’t necessarily doing exactly the same thing.

If you’re severely sleep deprived, 20 minutes isn’t magically replacing several hours of missing sleep.

Think of it as a temporary boost — not repayment of your entire sleep debt.

Should You Work Out Hard After Poor Sleep?

Probably not.

This comparison shouldn’t be interpreted as:

“I slept three hours, so I’ll do an exhausting two-hour workout.”

That’s not what we’re suggesting.

When sleep deprived, reaction time, coordination, judgment, and physical performance can be affected.

If you decide to exercise after a poor night’s sleep, a moderate approach makes more sense.

Walking.

Light jogging.

Cycling.

Mobility work.

Moderate resistance training.

The goal is to wake yourself up and get moving — not punish your body for sleeping badly.

Can Either One Replace Sleep?

No.

This is the most important part of the entire comparison.

Neither exercise nor a nap should become an excuse for chronically insufficient nighttime sleep.

Adults generally need at least seven hours of sleep per night, according to CDC guidance, although individual needs vary.

Regularly sleeping too little is associated with numerous health problems.

Exercise can temporarily improve how you feel.

A nap can provide additional rest.

But neither strategy completely substitutes for consistent, adequate nighttime sleep.

If poor sleep becomes a regular pattern rather than an occasional bad night, fixing the underlying sleep problem matters more than choosing between a workout and a nap.

What Should You Do After One Bad Night?

Here’s a simple way to decide.

If you’re tired but functional, try a short period of moderate exercise.

A 20-minute walk may be enough.

If you’re struggling to keep your eyes open, a nap probably makes more sense.

And if your schedule allows?

You don’t necessarily have to choose.

A short nap followed later by some light activity may give you benefits from both approaches.

Just avoid turning one poor night into several.

If you nap too late or sleep too long during the day, it may make falling asleep that night more difficult.

Your main objective should still be getting back to your normal sleep schedule.

Compareason Verdict

So, after a bad night’s sleep:

Workout or nap?

Our Pick: Workout — by a small margin.

For the average person who had one unusually bad night, moderate exercise is our pick.

It’s quick.

It can increase alertness.

It may improve mood.

And recent research suggests exercise may even help protect memory performance following sleep deprivation.

But there’s an important exception.

If you’re genuinely struggling to stay awake, choose the nap.

Your body is giving you a pretty clear message.

The most interesting takeaway from the recent research isn’t necessarily that one strategy defeats the other.

It’s that both may have value.

Workout when you need to wake up.

Nap when you truly need to sleep.

And tonight?

Get to bed on time.

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