The most common symptom of insomnia is trouble or difficulty sleeping, which causes lack of sleep. If you suffer from insomnia, you may experience:
- Lying awake for a long time at night before you fall asleep
- Wake up several times at night
- Wake up early and could not get back to sleep
- Feeling tired and not enough rest
- Become anxious, irritable and depressed
More → Symptoms of Insomnia