The high frequency of urination at night may be related to eating a lot of food containing a lot of water at night, because nowadays a healthy diet is advocated with a light diet at night. It may also be related to drinking a lot of water during the day. After lying flat at night, a lot of water stored in the lower extremities returns to the heart, and the amount of water circulating through the whole body increases, which can lead to increased perfusion of the kidneys, and the amount of urine formed increases significantly, making many people have frequent urination. There are also some patients, such as men with prostate enlargement, who will have increased nighttime urination after sleep, mainly due to poor urination and the inability to urinate cleanly each time. This condition requires a prostate ultrasound and oral alpha-blockers to make urination more fluid.