There are many clear and measurable side effects to untreated sleep apnea, from daytime fatigue to high blood pressure. What is tougher to see is the connection between depression and sleep apnea, and what impact the combination can have on the person with an untreated sleep disorder. How Sleep Apnea And Depression Are Linked On its own, depression cannot cause obstructive sleep apnea. There is a lack of other physiological triggers which lead to the relaxing of the muscles in the upper airways that cause obstructive sleep apnea. However, untreated sleep apnea can trigger depression. This triggering is caused by...