Health risks of sleep deprivation: What happens when you don't sleep enough

Many people underestimate the importance of sleep, considering it a waste of time. However, sleep is a crucial biological process during which the brain repairs itself, regulates hormones and resets the entire body system. Regular sleep deprivation gradually damages nearly every organ in the body.

Experts say an adult needs an average of 7 to 9 hours of sleep daily. Consistently getting less than this is considered chronic sleep deprivation, which increases the risk of various complex diseases.

Effects on the brain: Memory loss and poor decision-making

Lack of sleep affects the brain most rapidly. Insufficient sleep leads to reduced concentration, difficulty retaining new information, and weakened decision-making abilities. Long-term sleep deprivation prevents neurons from functioning properly, resulting in increased forgetfulness, restlessness and mental fatigue. Studies have shown that a sleep-deprived person's reaction time can be similar to that of someone under the influence of alcohol.

Increased risk of heart disease

Lack of sleep raises cortisol levels, the stress hormone. This increases blood pressure and puts extra pressure on the heart. Prolonged sleep deprivation significantly raises the risk of high blood pressure, heart attack and stroke. Irregular sleep is a silent but powerful risk factor for heart disease, according to experts.

Diabetes and weight gain

Sleep deprivation disrupts the body's insulin regulation, raising blood sugar levels and increasing the risk of type 2 diabetes. Additionally, lack of sleep reduces the hunger-regulating hormone leptin while increasing ghrelin. This creates a tendency to eat more, especially increasing cravings for junk food, leading to rapid weight gain.

Weakened immune system

Sleep strengthens the body's immune system. Without adequate sleep, the body becomes weaker against viruses and bacteria. Those who regularly sleep less are at higher risk of catching common colds and coughs, as well as more serious infections. Even vaccine effectiveness may be reduced.

Impact on mental health

Sleep deprivation directly attacks mental health, increasing anxiety, depression and mood swings. In many cases, prolonged sleep problems can deepen depression. Changes in social behaviour, such as increased irritability, loneliness and loss of interest, are also observed.

Premature aging and skin damage

During sleep, the body produces collagen and repairs the skin. Lack of sleep disrupts this process, leading to pale skin, dark circles under the eyes, wrinkles, and signs of premature aging. Many experts refer to this as 'sleep-deprived face'.

Hormonal imbalance

Lack of sleep creates major disruptions in the body's hormonal system, particularly affecting the balance of thyroid, growth hormone and stress hormones. This can impair growth, energy levels, reproductive health and overall physical performance.

Reduced work efficiency and accident risk

Sleep deprivation reduces work efficiency. The tendency to make mistakes increases in tasks such as office work, studying or driving. Driving while sleep-deprived is extremely dangerous—research suggests it can be as risky as driving under the influence of alcohol.

How to maintain healthy sleep

Experts recommend following simple habits to improve sleep:

Sleep and wake up at fixed times daily

Reduce mobile phone and screen use before bedtime

Avoid caffeine and heavy meals at night

Keep the sleeping environment calm and dark

Exercise regularly but lightly