This condition of urinating in the morning with a dark yellow color is generally a normal physiological phenomenon! It is caused by people not being able to drink water during sleep. The main reason is that the human body secretes anti-diuretic hormone during sleep, so it causes the concentration of urine. This phenomenon is a normal physiological phenomenon and can be improved by increasing the amount of water drunk within two hours before going to bed. But in general, it is not recommended to drink water within two hours before bedtime, otherwise it will easily increase. The phenomenon of night rise, resulting in reduced sleep quality. The correct way to drink water is to drink a lot of water during the day, two hours before bedtime can not drink water, unless it is a special stone disease patients, asked to drink water, but it is recommended that it is best to be able to check the urine analyzer at the hospital to clarify whether there is an infection. If there is no infection in this case, there is no need to worry about the normal physiological phenomenon.