Depressive disorders, which are characterized by depressed mood, loss of interest, and reduced energy leading to diminished activity, are one of the most commonly diagnosed psychiatric disorders, affecting more than 264 million people worldwide.
1 More than 50 million people in China (3.6% of the population) experience depressive disorders each year.
2 Sleep disturbance is the prominent symptom in patients with depression, and in China 64.6% of them reported insomnia.
3 Depression and sleep issues have a bidirectional relationship. Poor sleep quality contributes to the development of depression, and having depression makes a person more likely to develop sleep issues.
4,5 Patients with co-occurring depression and sleep disorders have a higher risk of suicide and severe impairment in social functioning than patients who have depression alone.
6,7 These co-occurring disorders are difficult to treat and confer a greater risk of relapse and recurrence of depression.
8,9