Insomnia and obstructive sleep apnoea (OSA) are the two most common sleep disorders. Insomnia is a known risk factor for incidence and severity of depression, recurrence of depressive episodes and even suicide.[1] Several studies have also shown that OSA can contribute to the development of depression.[2] Insomnia and OSA often co-occur, but previous research has not addressed the interactions, for example, whether this co-occurrence is associated with worse depression.
