The role of sleep for humans

Sleep is a fundamental physiological need, indispensable in human life. Just like eating, breathing, or exercise, sleep is the process of restoring energy to the body and brain after a day of activity. On average, each person spends about one-third of their life sleeping, equivalent to about 7-8 hours per day.

Good sleep not only helps the body rest, but also directly affects memory, emotions, cognitive abilities, immunity, and longevity. Numerous medical studies have shown that people who frequently suffer from insomnia or insufficient sleep are at a higher risk of developing cardiovascular diseases, diabetes, obesity, depression, and weakened immunity.

However, in modern life, many people are facing insomnia, difficulty falling asleep, shallow sleep, or waking up in the middle of the night. The causes can stem from stress, electronic device use, improper diet, or circadian rhythm disorders. Therefore, understanding how to get a good night's sleep is essential for protecting both physical and mental health.

Reasons why many people don't sleep well.

Before discussing improvement measures, it's necessary to understand the common causes of sleep disorders. These can be divided into three main groups: biological, psychological, and lifestyle causes.

1. Biological causes

• Circadian rhythm disruption: The human body operates according to a natural "biological clock" that controls the sleep-wake cycle. When this rhythm is disrupted due to night shifts, jet lag, or irregular sleep schedules, the body will have difficulty falling into deep sleep.

• Age: Older adults tend to sleep less and have more restless sleep compared to younger people.

• Medical conditions: Certain conditions such as gastroesophageal reflux, joint pain, nocturia, endocrine disorders, sleep apnea, or depression can all seriously affect sleep.

2. Psychological causes

• Stress, anxiety, and depression: These are the most common causes. When under stress, the body releases the hormone cortisol, which increases heart rate and blood pressure and inhibits the secretion of melatonin (the hormone that induces sleepiness).

• Work and study stress: Working overtime and overthinking before bed prevent the brain from "disconnecting," leading to restlessness.

3. Causes related to lifestyle and environment

• Using electronic devices before bed: The blue light from phone and computer screens inhibits melatonin production, tricking the brain into thinking it's still daytime.

• Drinking coffee, tea, energy drinks, alcohol, or smoking in the evening: Caffeine and nicotine are strong stimulants that excite the nervous system, making it difficult for the body to relax.

• Unsuitable sleeping environment: Temperature, light, noise, or an uncomfortable mattress can also disrupt sleep.

• Lack of exercise: People who are inactive often have difficulty sleeping soundly because their bodies haven't used up enough energy during the day.

Consequences of poor sleep

Insomnia or insufficient sleep has many negative impacts on physical and mental health. Some of the easily noticeable consequences include:

1. Reduced concentration and memory

The brain needs deep sleep to consolidate memories and process information. When sleep-deprived, learning, creativity, and decision-making abilities are all diminished.

2. Emotional disturbances, irritability, depression

People who suffer from insomnia often feel tired, lethargic, and more sensitive to stress. In the long term, lack of sleep increases the risk of anxiety disorders and depression.

3. Immunodeficiency

Many studies indicate that sleeping less than 6 hours a night makes the body more susceptible to colds and infections due to a weakened immune system.

4. Risk of obesity and diabetes

Lack of sleep alters hormones that control hunger (ghrelin) and satiety (leptin), leading you to eat more, especially sweets and fatty foods. At the same time, insulin becomes less effective, increasing the risk of type 2 diabetes.

5. High blood pressure, cardiovascular disease, and stroke.

People who regularly lack sleep are at a higher risk of cardiovascular disease, as sleep helps regulate blood pressure and heart rate.

6. Reduced life expectancy and quality of life.

Numerous long-term studies have shown that people who sleep less than 5 hours a day have a lower average lifespan compared to those who get enough sleep.

How to get a good night's sleep

To improve sleep quality, a combination of physical, psychological, and environmental measures is needed. Below are ten important tips to help you fall asleep more easily and sleep more soundly.

1. Maintain a regular sleep-wake schedule.

The most important thing is to maintain a consistent sleep and wake-up time every day, including weekends. This habit helps your body "remember" and adjust its biological clock, making it easier to feel sleepy at a fixed time and wake up naturally without an alarm.

If you frequently change your sleep schedule, your body will disrupt its circadian rhythm, causing fatigue, difficulty concentrating, and prolonged insomnia.

2. Create the ideal sleeping environment.

Bedrooms should be quiet, dark, well-ventilated, and clean.

• Suitable temperature: Around 25–27°C is comfortable for most people.

• Lighting: Turn off the lights or use blackout curtains to help your body produce melatonin more easily.

• Sound: If you live in a noisy area, you can use a white noise machine or earplugs.

• Bed and pillows: The mattress should be of moderate firmness, neither too soft nor too hard. The pillows should support the head and neck in the most comfortable position.

Bedrooms should not double as workspaces, dining areas, or TV viewing spaces, so that the brain "understands" that this is a place for rest, not a place of stress.

3. Limit the use of electronic devices before bedtime.

Blue light from phone, computer, and TV screens inhibits the secretion of melatonin – the hormone that regulates sleep. Ideally, you should stop using electronic devices at least 30–60 minutes before bedtime. Instead, you can read a physical book, listen to calming music, or practice meditation.

4. Avoid eating too much or drinking too much water in the evening.

Eating too much makes the stomach work harder, causing difficulty sleeping. Spicy, fried, or fatty foods, in particular, can cause reflux and bloating. Limit your fluid intake after 9 PM to avoid waking up in the middle of the night to use the bathroom, which can disrupt your sleep. If you feel hungry, you can have a light snack such as a banana, warm milk, or walnuts – foods containing tryptophan, which helps the body produce serotonin and melatonin naturally.

5. Avoid caffeine, alcohol, and nicotine.

• Caffeine in coffee, tea, chocolate, and energy drinks stimulates the central nervous system, keeping you awake for hours. Avoid consuming them after 3 PM.

• While alcohol may make you fall asleep quickly, it can also disrupt your sleep and make you more likely to wake up in the middle of the night.

• Nicotine in cigarettes is a powerful stimulant, causing a rapid heartbeat and difficulty sleeping.

6. Regular physical activity

Exercise helps the body release excess energy, increases the production of endorphins, and improves mood. People who exercise for at least 30 minutes a day (walking, yoga, cycling, swimming) tend to sleep more soundly. However, strenuous exercise right before bed should be avoided, as increased cardiovascular activity makes it difficult for the body to relax.

7. Relieve stress – relax before bed.

A good night's sleep comes when the mind is at peace. You can:

• Take a warm bath for 15–20 minutes before bed to relax your body.

• Listen to calming music, meditate, practice deep breathing, or write a gratitude journal.

• Practice mindfulness meditation – focus on your breath, without thinking about the past or the future.

Deep breathing exercises (4-7-8) or gentle yoga before bed can help lower your heart rate and make it easier to fall asleep.

8. Maintain a positive attitude and avoid anxiety.

Many people suffer from insomnia because they have a fear of not being able to sleep. The more they try to force themselves to sleep, the more stressed they become and the harder it is to fall asleep. Instead, think of it as "just resting is enough." When your body relaxes, sleep will come naturally.

9. Apply the 20-minute rule.

If you lie in bed for more than 20 minutes and still can't fall asleep, get out of bed and go to another room to read a book or listen to some relaxing music. Don't try to stay awake – this causes your brain to associate the bed with feelings of anxiety and insomnia. When you start to feel sleepy, return to bed.

10. Consult a doctor when necessary.

If you experience prolonged insomnia (more than 3 weeks) or frequent sleep disruptions, you should see a doctor to determine the cause. Doctors may prescribe cognitive behavioral therapy (CBT-I) or sleep aids for a short period. Do not self-medicate with sedatives as they can be addictive.

The role of nutrition in sleep

A healthy diet can help regulate sleep effectively.

Foods that promote good sleep: warm milk, bananas, walnuts, oatmeal, salmon, green vegetables, eggs.

• Foods to limit in the evening: spicy foods, fried foods, coffee, sugary drinks, beer and alcohol.

• Supplementing with magnesium and vitamin B6 helps relax muscles, reduce stress, and promote melatonin production.

Good sleep – the foundation of happiness and productivity.

A good night's sleep not only improves your health but also boosts your work performance, creativity, memory, and mood. People who sleep well tend to be more alert, patient, confident, and better at controlling their emotions.

Conversely, prolonged sleep deprivation traps the body in a vicious cycle: fatigue – anxiety – insomnia – stress – illness. When you learn to value sleep, you'll realize it's not a waste of time, but a valuable investment in your health and longevity.

Conclude

There's no magic secret to getting a good night's sleep. It's the result of a balanced lifestyle, a relaxed mind, and respect for your body's natural circadian rhythm.

Starting with the smallest things — turning off your phone early, going to bed on time, exercising regularly, eating healthily — you'll gradually feel the positive change: falling asleep faster, sleeping more soundly, and waking up feeling energized.

A person who sleeps well is a healthier, more cheerful, and happier person. Think of sleep as a precious gift you give yourself every day.