Hello, Contributing factors ma likely be nighttime habits such as snoring, breathing through your mouth causing dehydrated tissue and grinding your teeth whe sleeping. A change in climate can cause sinus congestion. HeRing and cooling systems can also present a dry atmosphere. Stress can bring on a grinding habit and explain why during a holiday, you did not experience discomfort. I suggest that you mention this to your dentist and proceed with recommendations according to your diagnosis. There are some drug store night guards available for purchase if you want to try them. Thank you for your inquiry. I hope my suggestions are helpful.