Catatonic depression is a subtype of depression characterized by not speaking or responding to things for a prolonged period. Catatonia can be a part of several other mental health conditions, including schizophrenia and mood disorders. Learn more about the symptoms, treatment, and recovery in this article.

Facial tics are sudden, involuntary muscle movements in the face. They can be mild or severe, making it difficult for a person to carry out everyday activities. Facial tic disorders include transient tic disorder, chronic motor tic disorder, and Tourette's syndrome. Read about treatment, and when to see a doctor.

How do your sleep-wake preferences affect your risk of developing a mood disorder such as depression? A large, detailed observational study investigates.