For the past three weeks if not more,my throat is dry at night but it is not painfull or soar.During the day I do not have this problem.I do not sleep with my mouth open or the heating system on.What could be the problem.I have gugled with salt water and disprins but this doesn't seem to resolve the problem.

If you get a vapourizer (places steam in the air), it might help, I had the same problem and it was because my house was dry :) hope I helped!