t it cause larger post void volumes?, which itself can cause
nocturia. By the way by definition,
nocturia alone, as in your case, is not a sufficient condition for Over Active Bladder (OAB) as can be seen from the following link:
http://www.auanet.org/common/pdf/education/clinical-guidance/Overactive-Bladder.pdf
In OAB, increased urinary frequency (both Day and Night) along with low urine volume with urgency, with out UTI are considered the main criteria.