If your boyfriend urinates a lot at night, it is advisable to see a urologist. A urologist can do routine urinalysis, prostate ultrasound, prostate fluid laboratory tests, and urodynamic tests. The routine urine examination is used to determine whether there is inflammation. Prostate fluid examination, you can determine whether there is prostatitis. And prostate ultrasound examination, you can determine the size of the prostate, whether there is residual urine. Urodynamic examination, which checks whether there is bladder outlet obstruction and whether there is a significant change in bladder contractility. The most common may be prostatitis, mild prostatic hyperplasia, it is recommended to take oral alpha blockers, representative drugs are Harlequin, Alfuzosin, one oral tablet every night before bedtime, can improve the increase in the number of nocturnal urination.