Rest & Recovery

Why Recovery Matters for Muscle Growth

When you lift weights, your muscles are exposed to mechanical tension, which stimulates the processes involved in muscle growth. One of these is muscle protein synthesis, through which your body builds and repairs muscle proteins. Over time, regular training combined with adequate nutrition and recovery allows your muscles to adapt, gradually becoming bigger and stronger. But these adaptations take time, and constantly pushing yourself without recovering properly can make it harder to perform well in your next training sessions.

Sleep plays an important role in this process. Your body continues to recover between workouts, and getting enough sleep helps support the physical and mental functions you need to train effectively. Not getting enough of it can affect your energy levels, concentration, mood and exercise performance. Sleep also influences appetite regulation, which can become particularly relevant when you're trying to lose body fat. Research has even shown that insufficient sleep can negatively affect body composition during a calorie-restricted diet.

Of course, one bad night won't suddenly ruin your progress. But if you're regularly exhausted, struggling through your workouts and not giving yourself enough time to recover, you're making things unnecessarily difficult. Training provides the stimulus for progress, but recovery is what allows your body to adapt to it.

How Much Sleep Do You Really Need?

For most adults, around 7 to 9 hours of sleep per night is a reasonable goal. Some people function well with a little less than others, and those who train frequently or have particularly demanding schedules may benefit from additional sleep.

Rather than trying to hit one exact number every night, pay attention to how you feel throughout the day. If you're constantly tired, struggle to concentrate or regularly need large amounts of caffeine just to stay awake, you might not be getting enough sleep. And spending eight hours in bed doesn't necessarily mean you've actually slept for eight hours.

A consistent sleep schedule can help regulate your internal clock. Going to bed and waking up at roughly the same times makes it easier for your body to develop a regular sleep pattern. That doesn't mean you have to follow a strict schedule every single day, but constantly changing your sleeping hours can make things unnecessarily difficult.

If you don't manage to get enough sleep at night, taking a nap during the day can also be helpful. A short nap of around 10 to 30 minutes can improve alertness and reduce tiredness without leaving you feeling too groggy afterwards. Longer naps can be useful too, especially after insufficient sleep, but they may leave you feeling sleepy for a while after waking up. If you already struggle to fall asleep at night, taking long or late naps might not be the best idea.

Improve Your Sleep Quality

Getting enough sleep is important, but so is actually being able to fall asleep and stay asleep. Fortunately, there are a few things you can do to make that easier.

One of the most important factors is your body's internal clock, also known as the circadian rhythm. It helps regulate when you naturally feel awake or sleepy and is strongly influenced by light.

Melatonin plays an important role here. It's a hormone produced mainly in the pineal gland of the brain, and its release normally increases in the evening as it gets dark. Melatonin helps signal to your body that it's nighttime, making it part of the system that regulates your sleep-wake cycle.

Light can influence this process. Bright light in the evening can delay melatonin production, and light containing a higher proportion of blue wavelengths is particularly effective at suppressing it. That's why spending your entire evening in a brightly lit room or staring at a very bright screen may make falling asleep more difficult.

However, this doesn't mean you absolutely have to stop watching TV or using your smartphone an hour before bed. The brightness of the light, how long you're exposed to it and what you're doing all play a role. Dimming the lights, lowering your screen brightness or using a warmer display setting can be practical ways to reduce evening light exposure.

Your sleeping environment matters too. A dark, quiet and comfortably cool bedroom is generally a good starting point. Around 17 to 19°C works well for many people, although the ideal temperature varies. There's no need to force yourself to sleep in a freezing room just because someone claims a particular temperature is optimal.

Caffeine is another factor worth paying attention to. It can interfere with sleep even if you don't noticeably feel stimulated by it anymore. Its effects depend on the amount you consume, your individual sensitivity and how close to bedtime you have it. Avoiding larger amounts for at least six hours before bed is a reasonable starting point, but some people may need considerably more time. The same applies to pre-workout supplements containing caffeine, which can sometimes provide quite substantial doses.

Alcohol can also interfere with sleep. Although it may initially make you feel sleepy, it can disrupt sleep later in the night. And if you regularly wake up because you need to use the bathroom, reducing the amount you drink shortly before bed might help. There's no reason to deliberately dehydrate yourself in the evening, though.

You also don't need to avoid carbohydrates at night. Eating rice, potatoes or other carbohydrate-rich foods with dinner won't automatically interfere with your sleep or make you gain weight. What matters more is whether you feel comfortable after eating. Very large meals immediately before bedtime can cause discomfort for some people, but there's no universal rule that everyone needs to finish eating several hours before going to sleep.

The same goes for exercise. There's no general reason to avoid training in the evening, and research suggests that evening exercise usually doesn't have a negative impact on sleep. Very intense workouts ending shortly before bedtime may cause difficulties for some people, however. If you notice that you struggle to fall asleep after a particularly demanding session, try finishing a little earlier or leaving yourself more time to wind down.

Rest Days and Training Recovery

Sleep is only one part of recovery. How you organize your training and what you eat also play an important role. Every demanding workout creates fatigue, and your body needs time to recover before you can train at your best again. How much time depends on the intensity and volume of your training, as well as how accustomed you are to the workload. You don't necessarily need a complete rest day between every workout, but constantly pushing yourself without sufficient recovery can eventually affect your performance and progress. Getting enough calories, protein and other nutrients is also important, especially when you're following a calorie-restricted diet.

If you're constantly exhausted, your performance keeps declining or you're struggling to recover between workouts, it might be time to reduce your training load for a while. This is where a deload can be useful, allowing you to reduce accumulated fatigue by temporarily lowering your training volume or intensity. I've covered how to approach deloads in more detail in my Deload article.

Rest days don't mean you have to spend the entire day lying on the couch either. Going for a walk, cycling at an easy pace or doing some light physical activity is perfectly fine. And don't use muscle soreness as a measure of how effective your workout was. You can make excellent progress without feeling sore the next day, just as being extremely sore doesn't necessarily mean you've had a better workout.

Massages, cold baths and other recovery methods may help reduce soreness, but they aren't essential for making progress. In fact, regularly taking ice baths immediately after strength training may even slightly reduce muscle growth over time. So there's no need to overcomplicate recovery with expensive treatments or special routines when the basics already make such a difference.

Can Supplements Help You Sleep?

If you're already getting enough sleep, eating well and following a sensible training program, supplements probably won't make a dramatic difference to your recovery. Nevertheless, a few substances have been investigated for their potential effects on sleep, and some of them can be useful in certain situations.

Melatonin is probably the best-known example. As explained earlier, it's a hormone involved in regulating your sleep-wake cycle. Supplementing it can be helpful when your internal clock is out of sync, such as during jet lag or certain circadian rhythm sleep disorders. However, it isn't a particularly reliable solution for every kind of sleep problem, and it's not generally recommended as the first treatment for chronic insomnia.

For jet lag, doses between approximately 0.5 and 5 mg have been studied, with higher doses not necessarily providing greater benefits. The timing of supplementation is particularly important because taking melatonin at the wrong time can shift your internal clock in the opposite direction. Short-term use appears reasonably safe for most adults, but possible interactions with medications and uncertainties about long-term use should still be considered.

Glycine is another interesting option. It's an amino acid that your body can produce on its own and that is also found in many protein-containing foods. Small studies using around 3 g before bedtime have reported improvements in subjective sleep quality, tiredness and certain measures of sleep performance. Some results are promising, but the available studies are relatively small, so it's too early to treat glycine as a reliably effective sleep supplement. If you're interested in trying it, 3 g taken roughly 30 to 60 minutes before bedtime is the amount most commonly investigated.

Magnesium is another supplement that may help improve sleep. It's an essential mineral involved in normal muscle and nerve function, and some studies have found improvements in sleep quality with supplementation. Magnesium bisglycinate is particularly interesting because the magnesium is bound to glycine, the same amino acid discussed above. In a placebo-controlled study, this form produced a small improvement in insomnia symptoms. Whether that benefit came from the magnesium, the glycine or their combination isn't entirely clear, but it can be a reasonable option to consider, especially if your magnesium intake is low.

And if you're regularly struggling to fall asleep, waking up throughout the night or feeling exhausted despite allowing enough time for sleep, it's worth finding out why. Problems such as sleep apnea can affect sleep quality without you necessarily noticing what's happening during the night. Persistent insomnia also deserves more than simply experimenting with supplements. Cognitive behavioural therapy for insomnia, known as CBT-I, is an established first-line treatment for chronic insomnia and can help address the underlying sleep difficulties.

Closing Words

If you want to build muscle, improve your performance or simply stay healthy, recovery needs to be part of your training plan. Getting enough sleep, eating properly and allowing your body sufficient time to adapt are much more important than trying every recovery method or supplement available. You don't have to avoid challenging workouts or spend entire days doing nothing, but you should give your body a fair chance to recover from the effort. After all, training harder only makes sense if you can actually recover from it.

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Originally created post: 06/2009
Last updated: 10/2026