yes in the night it can come from more reasons , one is snoring , the other is sleeping with ones mouth open, but it can also come form allergy to dust mites if one sleeps on a pillow that is not often washed and hard dried and one has allergy to dust mites... I also have that and have to wash my pillow more othen than many have to , usually I have 2-3 layers of fabric around my pillow so that it is easy to keep totally clean, dust mite allergy also can give dry eyes and nose