Dr. Oz urges patients and doctors alike not to ignore insomnia as a link to other potentially more serious disorders, Examiner.com reports.

Dr. Oz said chronic insomnia could also be a warning sign of depression and anxiety. This is also something you should never ignore, as depression is a serious health condition that could have devastating consequences.

The world is reeling from the tragic suicide of actor Robin Williams, who hanged himself Aug. 11 at his California home,¬†USA Today¬†reported. In a statement, Williams’ rep revealed Robin had suffered from severe depression, both recently and throughout his adult life.

Dr. Ash said symptoms of depression-induced insomnia include recurring bad dreams, extreme sensitivity to noise such as a ticking clock, and racing thoughts that keep you up at night.