The DRS stands for Drag Reduction System, which enables a car to open its rear wing to limit the downforces on the car. This increases the car's theoretical performance and in theory facilitates passing.
The surgical treatments for obstructive sleep apnea include nasal surgery, palate surgery (including uvulopalatopharyngoplasty [UPPP]), upper airway stimulation therapy, tongue reduction surgery, genioglossus advancement, maxillo-mandibular advancement, tracheostomy, and bariatric surgery.
Other types of surgery may help reduce snoring and contribute to the treatment of sleep apnea by clearing or enlarging air passages: 1  Nasal surgery to remove polyps or straighten a crooked partition between your nostrils (deviated nasal septum) 2  Surgery to remove enlarged tonsils or adenoids. 3  Weight-loss surgery.