I feel my mouth dry while in a sleep makes me so uncomfortable breathing air feels so dry that my throat,  tonsils walls of throat are dry when I fall and sleep and eventually my nose also blocked as per right or left when turn my position when sleep Does it created by low humidity air .. ? Or any other reasons ? And lot of thick mucus are coming out in morning with cough some times without cough but I drink water around 1/2 liter before I'm going to sleep