A 48-year-old man suffered sudden cardiac death during the night after years of staying up late and maintaining two heart-damaging habits: heavy smoking and drinking alcohol while watching soccer matches.

Sudden Death Linked to Staying Up Late

After leaving his government job early and working from home, Mr. Xu (48, from Shanghai, China) had developed a habit of staying up late. He often spent his nights watching television, smoking cigarettes, and occasionally drinking beer or liquor while watching soccer games.

According to his wife, about two months before the incident, Mr. Xu began experiencing occasional chest pain and tightness, especially at night. Whenever he climbed stairs or walked briskly, he would feel short of breath, dizzy, and sometimes even experience temporary vision loss.

However, when family members urged him to see a doctor, he dismissed the symptoms. He believed that since he was approaching 50 and had gained considerable weight, his body simply needed time to adjust.

At around 1 a.m., after three consecutive nights of staying up late, Mrs. Xu heard her husband cry out for help, followed by a loud noise. She rushed downstairs and was shocked to find him collapsed on the floor, clutching his chest with both hands.

An ambulance was called immediately, and he was rushed to the hospital.

After examination, doctors diagnosed him with an acute myocardial infarction (heart attack). Despite hours of intensive efforts by the medical team, they were unable to save him. Mr. Xu passed away that same night at only 48 years old.

According to Dr. Yin Zhaofang, Deputy Director of the hospital’s Cardiology Department, the heart attack was primarily caused by Mr. Xu’s unhealthy lifestyle. Specifically, he frequently stayed up late and combined it with two particularly harmful habits: heavy smoking and alcohol consumption.

Why Staying Up Late Can Harm Your Health

Sleep plays a crucial role in maintaining good health. During the night, the immune system performs important repair and recovery functions while helping the body eliminate harmful substances.

Scientists have found that beginning around 9 p.m., the human body naturally starts preparing for sleep. After one to two hours of relaxation, it enters deeper stages of rest.

The period between midnight and 1 a.m. is particularly important because the body reaches a state of deep restorative sleep. To benefit fully, people should ideally fall asleep one or two hours earlier.

From approximately 1 a.m. to 5 a.m., the body releases substances involved in cellular repair and immune enhancement. Staying awake during this period can shorten or completely disrupt these processes, eventually leading to noticeable health deterioration.

Furthermore, irregular sleep schedules disrupt the body's biological clock. This not only affects sleep quality but can also seriously interfere with hormonal regulation and metabolic functions.

Like every other organ, the cardiovascular system needs adequate rest to recover and function properly. Consistently sleeping less than six hours per night significantly increases cardiovascular strain and may raise the risk of stroke by more than 20%.

When people stay awake late at night regularly, the brain requires increased blood flow. This places greater demands on the heart and blood vessels, causing blood pressure to spike. Excessive pressure on blood vessel walls can eventually lead to vessel rupture, stroke, sudden cardiac events, and even death.

Warning Signs That Your Body May Be Suffering From Sleep Deprivation

Fatigue, Headaches, and Difficulty Concentrating

The brain processes thousands of pieces of information every day. Sleep allows it to rest and organize this information. Staying up late forces the brain to continue working, leading to mental exhaustion, headaches, and reduced concentration.

Rapid Heartbeat

A healthy person's heart rate should remain relatively stable at rest. If you frequently stay up late and notice your heart racing when standing up suddenly—or even while resting—it may be a sign that your body is under stress.

Memory Decline

Studies suggest that people who regularly stay up late may be up to five times more likely to experience memory problems than those who maintain healthy sleep habits.

Sleep is essential for consolidating memories and processing daily experiences. Chronic sleep deprivation can impair these functions and gradually weaken memory performance.

Hormonal Imbalance

During sleep, the body produces and regulates important hormones. Frequent late nights can disrupt hormone production, leading to endocrine disorders.

In women, hormonal imbalance may contribute to irregular menstrual cycles and increase the risk of conditions such as uterine fibroids.

Stomach Problems

Sleep deprivation is a major source of stress and can contribute to stomach pain. During sleep, the stomach lining repairs itself. Staying awake late prevents this recovery process and may increase stomach acid production, leading to gastritis or ulcers.

For individuals who already suffer from digestive disorders, staying up late can worsen symptoms significantly.

Increased Risk of Diabetes

Research indicates that people who sleep fewer than five hours per night have approximately twice the risk of developing diabetes compared with those who sleep seven to eight hours.

Late-night wakefulness disrupts the body's biological clock, which plays a key role in regulating glucose metabolism.

Liver Damage

According to traditional biological rhythms, the period between approximately 11 p.m. and 1 a.m. is when the liver carries out important detoxification and metabolic functions.

These processes are most effective during deep sleep. Chronic sleep deprivation may impair the liver's ability to eliminate toxins, potentially increasing the risk of conditions such as hepatitis, fatty liver disease, cirrhosis, and even liver cancer.

Blurred Vision and Swollen Eyes

Staying up late for work, study, or entertainment places excessive strain on the eyes. Over time, this can lead to blurred vision, eye fatigue, and worsening eyesight.

Sleep deprivation can also reduce proper fluid circulation around the eyes, resulting in puffiness, swelling, eye twitching, and difficulty focusing.