Many people believe that sleeping just 5 hours a day is enough, as long as they can still work and go about their normal lives. However, this is not the ideal amount of sleep for most adults.
- How does lack of sleep affect the body?
- How can you tell if you're not getting enough sleep?
- What can be done to mitigate the negative effects of insufficient sleep?
- Make good use of afternoon naps.
Adults should sleep an average of 7-8 hours per night to allow their bodies and brains sufficient time to recover. Maintaining a habit of sleeping less than 5 hours for an extended period can increase the risk of developing many serious health problems.
How does lack of sleep affect the body?
Sleep is not simply a time for rest; it is also a period when the body regenerates energy, repairs damaged cells, and regulates endocrine activity.
When you don't get enough sleep, your body enters a state of prolonged stress, disrupting many important biological mechanisms. This not only affects your mental health but also directly impacts your cardiovascular system, metabolism, and immune system.
Weight gain and metabolic disorders
One of the common consequences of sleep deprivation is weight gain and metabolic disorders. Studies show that when you sleep too little, your body increases the production of cortisol – a hormone associated with stress. High cortisol levels lead to stronger cravings, especially for sugary and starchy foods.
In addition, lack of sleep reduces the body's ability to burn energy and accumulates excess fat, significantly increasing the risk of obesity.

Lack of sleep has a significant impact on mood and emotions.
Increased risk of developing diabetes.
Sleep plays a crucial role in regulating insulin and blood glucose metabolism.
When sleep deprivation is prolonged, the body is more likely to develop insulin resistance. This makes it difficult for glucose to enter cells for energy, leading to high blood sugar and increasing the risk of type 2 diabetes.
Additionally, people who get less sleep often feel hungrier and crave sweets more than usual, contributing to blood sugar imbalances.
Chronic sleep deprivation can also increase the risk of metabolic syndrome – a condition closely linked to diabetes and cardiovascular disease.
Memory loss and impaired concentration.
The brain needs deep sleep to process and store the information received during the day.
People who sleep little often experience the following:
- Difficulty concentrating
- Reduced memory capacity
- Slow reflexes
- Forgetful
Reduced learning and work performance.
In particular, for students or those engaged in intellectual work, prolonged late-night hours can significantly impair thinking and creative abilities.
Many studies also show that lack of sleep increases the risk of traffic accidents and workplace accidents due to impaired concentration or slow reaction times.
Weakened immune system
While you sleep, your body produces more immune proteins that help fight off viruses and bacteria.
When you don't get enough sleep, your immune system functions less effectively, making your body more susceptible to infections such as:
- Flu
- Sore throat
- Respiratory tract inflammation
- Viral infection
People who suffer from prolonged sleep deprivation tend to take longer to recover from illness.
Furthermore, chronic sleep deprivation increases the inflammatory response in the body, contributing to the development of many other chronic diseases.
Impact on mental health
Lack of sleep has a significant impact on mood and emotions.
People who sleep less than 5 hours a day are more likely to:
- Irritability
- Anxiety
- Stress
- Losing patience
- Boredom
When this condition persists, the risk of depression and anxiety disorders also increases.
Lack of sleep makes it difficult for the brain to regulate emotions, causing people to react more negatively to life's stresses.
How can you tell if you're not getting enough sleep?
Not everyone who sleeps less realizes that their body is suffering from sleep deprivation.
Some common warning signs include:
- Always feeling tired
- Daytime sleepiness
- Constant yawning
- Difficulty concentrating
- Forgetful
- Headache
- Eye strain
- Mood swings
In more severe cases, people who suffer from prolonged sleep deprivation may experience:
- Head tremors
- Droopy eyelids
- Nystagmus
- Reduced judgment ability
- Speaking is difficult.
- Even a brief loss of consciousness.
These are warning signs that your body is exhausted and needs adequate rest.
What can be done to mitigate the negative effects of insufficient sleep?
During certain periods, many people are forced to sleep less than usual. To minimize the negative impact on health, some of the following measures can be applied:
- Improve sleep quality
- Keep the bedroom quiet, cool, and dark.
- Limit your phone use before bed.
- Avoid drinking coffee or alcohol in the evening.
- Maintain a consistent bedtime each day.
- Relax before bed.
Activities such as reading, listening to soothing music, taking a warm bath, and practicing deep breathing exercises can help the body fall asleep more easily.
Make good use of afternoon naps.
A nap of about 20-30 minutes can increase alertness and improve work performance. However, you shouldn't nap for too long as it can make it difficult to fall asleep at night.
In summary: Quality sleep is a crucial foundation for both physical and mental health. Maintaining a habit of getting 7-8 hours of sleep each night not only helps the body recover but also contributes to preventing many dangerous diseases in the future.
Source: https://suckhoedoisong.vn/ngu-it-hon-5-tieng-moi-ngay-co-nguy-co-mac-benh-gi-169260521164630967.htm








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