The reason why kidney stones cause pain in the early morning or in the middle of the night is that at night we do not enter the water, coupled with the evaporation of the body surface, urine concentration, easy to make such as calcium oxalate, calcium carbonate, magnesium phosphate and other crystals precipitated to form stones, coupled with urine concentration will also reduce the volume of urine, with urine will be these crystals of small stones, pushed into the ureter, can cause obstructive pain, especially in the hot summer or the onset of pain This condition is more likely to occur after drinking a lot of alcohol the night before the onset of pain. In this case, you can drink 300 ml of water 2 hours before bedtime and try not to drink alcohol before bedtime to avoid the occurrence of stones.