1, environmental factors:

Noise or light interferes with sleep, high temperature or cold affects sleep, and the bedding is uncomfortable, such as too hard or too thick or thin. Changing the sleeping environment such as hospitalization or hotel can also lead to insomnia. People who sleep, especially those who snore loudly, can also affect their sleep.

2. Physiological factors:

High-speed travel across several time zones (time difference) and changing from day shift to night shift, insomnia is also because the biological clock in the body has not adapted to the new circadian rhythm.

3. Psychosocial factors:

Stress and various life events can lead to insomnia. Anxiety about getting sick of yourself or your loved ones, fear of surgery, fear of the death of your loved ones, and fear of taking exams or accepting important jobs are all common causes of temporary insomnia.

4. Physical illness:

Various painful diseases, such as heart and lung diseases, arthritis, advanced cancer, nocturia, gastrointestinal diseases, renal failure, hyperthyroidism, Parkinson's disease and so on, often cause insomnia.

5, mental illness:

Depression, schizophrenia, Alzheimer's disease, anxiety, obsessive-compulsive disorder and borderline personality disorder are often accompanied by insomnia.

6. Drugs:

The most common drugs that cause insomnia are caffeine, theophylline and various stimulants, as well as alcohol and appetite suppressants. This kind of insomnia is called rebound insomnia.