Obstructive Sleep Apnea (OSA) most likely is due to your tongue position.  The tongue determines the opening of the oral pharynx. As early as the 1940s, many studies pointed to the position of the tongue’s important in maintaining the airway. If you snore a lot, next time you visit a dentist, ask for a tongue examination and do a sleep apnea exam also.
It is important to know that OSA, TMD, and Bad Bite not a stand-alone problem. They are all inter-related like the moon goes around the earth, and the earth goes around the sun.