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.
Sleep apnea is a period during sleep in which breathing either stops or is markedly reduced; it can be broken down into three broad categories: 1  obstructive sleep apnea (OSA): where the airway is reduced/blocked.  central sleep apnea (CSA): when there is no neural signaling to breathe.