The Unemployment Insurance Appeal Board accepted the testimony of the employer's night audit manager that she found claimant sleeping on a couch while he was working his midnight to 8:00 A.M. shift as supervisory security officer. Although claimant denied that he had been asleep, this merely raised a question of credibility for the Board to resolve (see, Matter of Woods [Ross], 54 A.D.2d 515; Matter of Gadson [Catherwood], 28 A.D.2d 1049). In addition, sleeping while on duty was in violation of the employer's written rules which claimant had signed. Violation of a company rule of which an employee is aware has been held to constitute misconduct (see, Matter of Sylvester [Hartnett], 143 A.D.2d 478; Matter of Cirlin [Ross], 70 A.D.2d 1030). Accordingly, the conclusion that claimant lost his employment due to misconduct is supported by substantial evidence and must be upheld (see, Matter of Rossano [Levine], 52 A.D.2d 1006).
Casey, J.P., Mikoll, Yesawich Jr., Levine and Crew III, JJ., concur. Ordered that the decision is affirmed, without costs.