How does poor sleep affect training results?

Insufficient and poor sleep lowers energy levels and reduces performance during training, weakens strength, reduces muscle protein synthesis, and can mean you need longer recovery time between workouts because the body does not recover well enough overnight.

Why does too little sleep make it harder to control body weight?

Too little sleep increases cortisol, which stimulates fat storage, especially around the abdomen. It also creates an imbalance in the hormones that regulate hunger and satiety, increasing cravings for sweets and making poorer food choices more likely.

What can you do to fall asleep more easily?

Keep regular bedtimes and wake times, keep the bedroom dark and cool, dim the lighting 1-2 hours before bed, limit screen time from phones, computers and TV 1-2 hours before bed, limit caffeine and energy drinks late in the day, exercise regularly but not intensely right before bed, avoid daytime power naps, avoid sugar and fast carbohydrates before bedtime, and get outside in fresh air during the day.

Why should the bedroom be dark?

A dark room helps increase the body's production of melatonin, and light from screens inhibits that production.

Does one bad night of sleep harm your health?

No. According to the article, the effects do not occur after one or two nights of poor sleep, but the body and mind become gradually more weakened over time.

Why You Should Prioritize Getting Enough Sleep! | Hardworkout Magazine

Key takeaways

- Adults are recommended to sleep 7-9 hours each night for optimal recovery.

- Muscles grow during the recovery phase, and insufficient sleep reduces muscle protein synthesis.

- Too little sleep raises cortisol levels, which stimulates fat storage around the abdomen and contributes to muscle breakdown.

- A dark, cool bedroom and fixed bedtimes support melatonin production and a stable circadian rhythm.

- The damage from poor sleep builds up gradually over time rather than after one or two bad nights.

Everyone has experienced periods of little sleep and knows how it affects energy levels and mood. If it happens occasionally, we quickly recover, but if there are prolonged periods of little and poor sleep, it can have a significant impact on both physical and mental health.

There can be many different causes of poor sleep and sleep problems; the most important thing is not to let it go on for too long.

What happens to your body when you sleep too little?

Sleep affects many processes both in the brain and in the body, which is why it is important to focus on getting enough sleep, preferably every night.

How many hours of sleep do you actually need?

It is recommended to sleep 7-9 hours each night for optimal recovery.

Little and poor sleep leads to:

- Weaker immune system and more susceptible to getting sick.

- Higher levels of cortisol in the body.

- Low energy levels and inefficiency.

- Poorer mood and shorter temper.

- Reduced metabolism and increased cravings for sweet and unhealthy food.

- More susceptible to mental disorders such as anxiety and depression.

- Reduced cognitive function and memory.

- Increased blood pressure.

- Hormonal disturbances.

- Poorer training results and weakened strength and performance.

All of this does not happen after one or two nights of poor sleep, but gradually over time the body and mind will become more weakened.

Also read: [Best in test sleeping pills](https://hardworkout.no/sovepiller/)

How can you improve your sleep quality?

Maintain regular routines for when you go to bed and when you wake up.

When you establish a more stable circadian rhythm, you will automatically feel sleepier as bedtime approaches, and sleep quality will improve. Keep the bedroom dark and dim the lighting in the areas where you spend time 1-2 hours before you go to bed.

Having a dark room helps to increase melatonin production in the body.

Read also: [Melatonin – The Body's Sleep Hormone! How to Fall Asleep Faster](https://hardworkout.no/melatonin-kroppens-sovnhormon/) - Keep the bedroom cool and comfortable. If the room is too warm, it is difficult to fall asleep and easier to wake up throughout the night.

- Limit screen time from mobile devices, computers, and TVs 1-2 hours before bed, as the light from screens inhibits melatonin production.

- Limit caffeine and energy drink intake late in the day, as this will make it difficult to fall asleep in the evening.

- Exercise regularly, but avoid intense workouts right before bedtime.

- Avoid power naps during the day, as this will make it difficult to fall asleep again in the evening.

- Eat healthy and varied foods and avoid a lot of sugar and fast carbohydrates before bedtime.

- Get outside in fresh air during the day. If you are indoors all day, you become more sluggish and it becomes harder to sleep properly.

Read also: [Heart Rate Monitors – Best in Test](/magazine/heart-rate-monitor-best-in-test-2026-top-10-heart-rate-monitors-fitnes)

![Tips for improving sleep quality.](https://hardworkout.no/wp-content/uploads/2025/01/AdobeStock446606361.jpeg)

Why does poor sleep hold back muscle growth?

When you sleep, the body recovers and recharges energy levels.

It is during the recovery phase that muscles grow, so enough sleep is important for optimizing muscle growth. With insufficient and poor sleep, muscle protein synthesis will be reduced.

Why does too little sleep make you gain fat?

Too little sleep increases cortisol levels in the body.

Cortisol stimulates increased fat storage, especially in the abdominal area, and it contributes to muscle breakdown. Additionally, there will be an imbalance in the hormones that regulate hunger and satiety, leading to increased cravings for sweets and making it easier to resort to poorer food choices.

Furthermore, insufficient and poor sleep will lead to lower energy levels and reduced performance when you train.

It can also result in needing longer recovery time between workouts, as the body does not recover well enough overnight.

Read also: [Muscle Protein Synthesis – How Much Protein Should You Eat at Once?](https://hardworkout.no/muskelproteinsyntese-hvor-mye-proteiner-bor-du-spise-av-gangen/)

So prioritize getting enough sleep for the best possible training results and good health, no matter how busy your days are. Enough sleep will give you the energy and surplus for everything you need to do throughout the day!

![sleep](https://hardworkout.no/wp-content/uploads/2021/01/s2.jpg)

Sources:

Advice for Those Struggling with Sleep – [HelseNorge](https://www.helsenorge.no/sovnproblemer/rad-for-bedre-sovn/)

The effect of acute sleep deprivation on skeletal muscle protein synthesis and the hormonal environment – [National Library of Medicine(NIH)](https://pmc.ncbi.nlm.nih.gov/articles/PMC7785053/)

What Are Sleep Deprivation and Deficiency? – [National Heart, Lung and Blood Institute](https://www.nhlbi.nih.gov/health/sleep-deprivation)