Obstructive sleep Apnea (OSA) is associated with daytime sleepiness, fatigue and depression. According to a study of 51 Obstructive Sleep Apnea patients, who under went surgery to correct a deviated nasal septum and nasal obstruction, it was determined that the procedure was associated with improvements in snoring, sleepiness, fatigue and overall health.
Arch Otolaryngology Head & Neck surgery- April 2008 vol.134 (4):429-433