Dryness of mouth during night time, and there is no sleep. Pl advise for relief. I am 61 year old male. I am now regularly using 500 mg sazo500 and 5 mg folic acid in the morning and 500 mg sazo 500 in the night as per physicians advice since 4 -5 years for ankylosing spondylitis, though not having joint/low back pain now. But, for the last 2-3 years often come across this problem. At that time could not sleep throughout night due to dryness of mouth, with this I required. Water to drink. Although night drink water 4-5 times. No sleep, pl advise remedy.