Some demonstrative embodiments include apparatuses, devices, systems and methods of power management in a wireless network. For example, a wireless station may be configured to transmit a first frame including a first Wakeup Schedule Element (WSE), the first WSE including a first beacon interval (BI) start time field value; to switch to a Power Save (PS) mode based on the first BI start time field value; and during the PS, transmit a second frame including a second WSE, the second WSE including a second BI start time field value, e.g., different from the first BI start time field value.