Nocturia
It is the clinical name of waking up several times in the night with an urge to urinate. This symptom is usually found in association with other urinary symptoms, especially increased frequency of urination. It is reported in about 20% of patients with bladder cancer. Normally a person does not wake up more than once to pass urine in the night because during nighttime the body produces less urine, and it becomes more concentrated. However, it can be common and it is not always alarming in patients with higher fluid intake. Nocturia can be associated with sleep disorders, and only appears in patients with bladder cancer when the tumor has grown big enough to create alterations in the perception of the pressure of the urinary bladder.