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Why Sleep is Critical for Muscle Growth


calendar-iconApril 10, 2021

Build Muscle


Heads up! This article is connected to our Muscle Growth Journey page. For the complete picture on how to build muscle using our evidence-based system, check it out here!

While there is a lot of information about training and nutrition as it concerns muscle growth, one subject you won’t find a lot in fitness articles and magazines is sleep. As a result, many people embark on their fitness journeys without realizing how critical sleep is to reaching their muscle growth goals.

In this article, we’ll show you exactly why sleep is a critical part of muscle growth and transforming your body.

We’ll break down 5 reasons why sleep is critical for muscle growth, all supported by evidence and research. We’ll also show you what you need to be doing to get a good night’s rest and get all of the muscle growth benefits of optimal sleep!

By the end of this article, it should be clear to you why you should prioritize your sleep schedule if you are serious about growing as much muscle as possible.

5 Ways that Sleep Boosts Muscle Growth

First, we’ll highlight the specific studies that prove you should optimize our sleep schedule if you want to gain muscle as quickly as possible.

Here are the evidence based reasons why sleep is critical for muscle growth.

1. Sleep prevents muscle breakdown

Folks that do not get enough sleep end up losing muscle. Sleep deprivation has been shown to increase the activity of biological pathways such as cortisol ("the stress hormone") that lead to muscle breakdown.

In other words, by sleeping more, your muscles maintain their size and strength.

2. Your muscles grow during sleep

Studies have shown that certain stages of sleep promote the release of hormones, such as growth hormone; these are responsible for building muscle.

If you don't get a good night's sleep, your body does not hit every sleep cycle, and when that happens, then your muscles miss the opportunity for maximum growth.

3. Sleep helps your body perform athletically for longer periods

Sleep is critical for having enough energy to crush your workout. 

On the flip side, not getting enough sleep means that your body is not as efficient at converting food into energy, therefore you will get tired sooner. 

Multiple studies have shown that sleep deprivation in athletes reduces glucose metabolism (the conversion of sugars into fuel for muscles) by as much as 40%, causing exhaustion 20% sooner!

4. More sleep helps workouts feel easier

Every workout involves not only overcoming physical limits but mental limits as well. 

Believe it or not, sleep plays a big factor in your perception of how tired you are, or your rate of perceived exertion. 

In other words, not getting enough sleep will make you think your body is more tired than it actually is, and your workouts will pay the price!

5. Your muscles are stronger after a good night's rest

Research has also shown that sleeping a full night not only helps your muscles get stronger and grow bigger, but it also helps them be stronger during the day. 

If you were to lift weights 3 different days, one day after sleeping poorly, another day after getting a mediocre night of sleep, and lastly on a day after a very restful night, you will find that you can lift the most weight the day that you slept the most.

Why is that? Because getting enough sleep allows your muscles to perform at their full potential. On the flip side, sleep deprivation actually prevents your muscles from operating at their best.

How to Get a Good Night’s Rest

Now that you understand how important sleep is to muscle growth, you may be wondering how to get as much quality rest as possible. We break it all down in more detail in our Basics of Sleep article, but we’ll quickly summarize what you need to know here:

  • Try to get roughly 8 hours of sleep a night. You may need a bit more or a bit less, but the goal should be to be able to wake up without an alarm and not feel drowsy at any point during the day.
  • Try to go to bed at the same time every night. Your sleep will be higher quality if you are asleep at the same time every night.
  • Make sure your sleep is uninterrupted! Continuous sleep is the best kind of sleep, and ensures your body gets the most out of it’s time to recover.

These basics should be enough to get the quality sleep you need to build muscle, but if you want even more details on how to perfect your sleep schedule, check out our Basics of Sleep article!


That wraps up our guide for why sleep is critical for fat loss! We covered:

  • Sleep prevents muscle breakdown
  • Your muscles grow while you sleep, so sleeping more leads to greater muscle growth
  • Sleep is critical for getting the most out of your muscle growth workouts
  • Well rested people will find their workouts to be easier
  • Your strength is boosted if you are caught up on your sleep.
  • A consistent sleep schedule that provides around 8 hours of uninterrupted sleep is all you need to get all of sleep’s benefits concerning fat loss.

Knowing all of this, you should have plenty of reasons to prioritize getting a good night’s rest. If you want to reach your muscle growth as quickly and painlessly as possible, sleep is a critical component!

Heads up! This article is connected to our Muscle Growth Journey page. For the complete picture on how to build muscle using our evidence-based system, check it out here!

References and Useful Research

  1. Dattilo M, Antunes HK, Medeiros A, et al. Sleep and muscle recovery: endocrinological and molecular basis for a new and promising hypothesis. Med Hypotheses. 2011;77(2):220-2. Link
  2. Vanhelder T, Radomski MW. Sleep deprivation and the effect on exercise performance. Sports Med. 1989;7(4):235-47. Link
  3. Myles WS. Sleep deprivation, physical fatigue, and the perception of exercise intensity. Med Sci Sports Exerc. 1985;17(5):580-4. Link
  4. Chen Y, Cui Y, Chen S, Wu Z. Relationship between sleep and muscle strength among Chinese university students: a cross-sectional study. J Musculoskelet Neuronal Interact. 2017;17(4):327-333. Link
  5. Reilly T, Piercy M. The effect of partial sleep deprivation on weight-lifting performance. Ergonomics. 1994;37(1):107-15 Link

Date Created: April 10, 2021

Last Updated: April 17, 2021

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