Oops…
>>what if one is already thin?
1 cause of sleep apnea can be sinus issues. When you can’t breathe through your nose when sleeping, you breathe through your mouth. If on your back, when you enter REM/delta wave sleep, your muscles relax, jaw slides back & pinches off your airway. This results in oxygen desaturation which in turn begins to wake you up before you choke out. A sleep guard device is designed to prevent your jaw from sliding back.