What causes insomnia at night?

There are many causes of insomnia, primarily including the following:

1. Mental stress: Excessive daily pressure from work, study, or life may lead to emotional tension and anxiety, thereby affecting sleep.

2. Lifestyle habits: Irregular sleep schedules, using electronic devices before bedtime, and consuming stimulants such as caffeine can all interfere with sleep.

3. Environmental factors: Poor sleep environments, such as noise, excessive light, or an uncomfortable bed, may contribute to insomnia.

4. Physiological factors: Certain medical conditions or medications may disrupt sleep, such as pain, respiratory issues, or taking specific drugs.

5. Psychological factors: Excessive thinking, worrying about the future, or being overly excited can also lead to insomnia.