According to a recent study of 54 OSA patients sleep, mood and CPAP adherence (at the start of the study and again after 1-2 months), the results showed a significant correlation between improved OSA symptoms and a reduction of depressive symptoms after starting CPAP therapy. The results also showed that patients who continued to have OSA symptoms after CPAP therapy tended to have more depressive symptoms. The results suggest that CPAP treatment may lead to an improvement in symptoms of depression for its users.
Psychoson Med, 2007 Jun; 69(5); 449-54. Epub 2007 Jun7