Hello, There are some possibilities that come to mind: grinding your teeth, root sensitivity or infection. Your C-Pap machine may be a factor causing you to breathe through your mouth or adjust your jaw position while sleeping. They can have a drying affect on your tissue and make plaque harder to remove. From your brief description, I am suspect of this. Review side effects and consider any recent adjustments such as a new mask, pressure? Are you sleeping well? Other factorssuch as your diet, other medications, allergies or sinus congestion may be contributing to your discomfort. Discuss all symptoms with your dentist at your next recall visit if symptoms persist. If your condition worsens, consult your dentist for an appointment. Make sure you keep up with good daily dental care. Try toothpaste for sensitive teeth and fluoride rinses. Keep well hydrated. Monitor your symptoms for specific areas of discomfort or tissue changes. This will help with your diagnosis. Antiinflammitory medication such as Tylenol or Motrin can reduce discomfort and tenderness especially if your joint is sore. Thank you for your inquiry.