Why is your pee dark yellow in the morning?

Dark yellow urine in the morning is typically due to dehydration that occurs overnight while you sleep. During this time, your body continues to lose water through breathing and sweating, but you’re not drinking fluids. As a result, the concentration of waste products in your urine increases, leading to a darker color. Drinking water upon waking can help dilute your urine and restore its normal color throughout the day.