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The power saving mechanisms of the current IEEE 802.16e system are designed to take no consideration of the harmonization between power saving classes (PSCs) I and II. Hence, we propose a harmonized power saving mechanism between PSC I and PSC II to increase unavailability interval when a mobile station (MS) uses PSCs. The proposed mechanism adjusts the timing of the sleep window of PSC I to maximize the unavailability interval of the MSs. As a result, the proposed mechanism achieves power saving of the MSs. Through the simulation, we show that the proposed mechanism can reduce the power consumption of the MSs considerably compared with conventional mechanisms.