What is the ruling on the yellow saliva found upon waking from sleep; does it break the fast or not, and does swallowing it while asleep during fasting break the fast, and is it impure, and must what falls from it be cleaned?

The water that comes out of the mouth during sleep and frequently affects a person is excused, and there is no need to wash it due to the hardship. If a person swallows some of it while asleep, their fast remains valid, and there is nothing upon them.