In my experience as a psychiatrist, nearly everything we call a psychiatric symptom or problem, including insomnia, is in reality a signal that we have to face a new challenge in life.

Does insomnia cause depression? Does depression cause insomnia? Chronic insomnia is strongly associated with mood disorders, but which way does the causality run?

A survey of nearly 5,000 police officers in the United States and Canada revealed that these law enforcement professionals are frequently suffering from sleep problems -- and this lack of sleep is negatively affecting both their health and their performance on the job.