Final answer:
Nocturia is the term for excessive or frequent urination after going to bed. It can be caused by various factors including medical conditions like bladder infection or diabetes, as well as lifestyle factors such as fluid intake before bed or intake of diuretic substances.
Step-by-step explanation:
Excessive or frequent urination after going to bed is called nocturia. Nocturia is the need to wake up during the night to urinate. It can be caused by various factors including certain medical conditions like bladder infection, diabetes, or an overactive bladder. Additionally, consuming large amounts of fluids before bed or a high intake of diuretic substances such as caffeine or alcohol can contribute to nocturia.