Police after midnight on a recent Saturday found heroin on a 26-year-old New Canaan man who had fallen asleep at the wheel of a motor vehicle, officials said. According to a press bulletin from Police Chief Leon Krolikowski, officers at about 12:10 a.m. on July 1 were called to Frogtown Road on a report that a motorist was asleep at the wheel in a driveway there. Police searched the car and found “a quantity of heroin,” Krolikowski said. The man, a Knapp Lane resident, was charged with possession of narcotics, a misdemeanor offense. Police released him on $250 bond and scheduled the man to appear July 14 in state Superior Court in Norwalk.