“Why do I no longer feel the need to urinate?”

May have very large bladder. Any spinal cord issues, medications?

Thank you for asking this question. But in order to uncover if what you concern is meaningful (clinically significant) to you or not, it needs to review general and specific urinary history to address possible symptoms such as urinary frequency, urgency, incomplete bladder emptying, etc. with the related detailed sequence of event. Next, physical exam + urinalysis + postvoid residual urine check after a detailed record of intake and output (so-called voiding chart for reviewing your voiding pattern. Those as outlined above are the basic urological evaluation. Yet, I assumed you have been healthy without any discomfort or symptom particularly in voiding but "..feel nod to urinate?" Then you are probably okay as long as you are comfortable in urination with quick good start and ending after a steady urine flow and good volume. On the other hand, if something occurs and raises your concern recently, and you want to have clear mind, by all means, I highly advise you to go for a systemic evaluation and counseling preferably by a urologist. I wish you the best for health and happiness. Sincerely, CTL.

Main reason could be dehydration.