Some demonstrative embodiments include apparatuses, devices, systems and methods of power management in a wireless network. For example, a first wireless station may be configured to transmit a frame to a second wireless station during a first beacon interval, the frame including an indication that the first wireless station is to switch to a low power mode; switch to the low power mode; operate at an active mode during an awake window in a second beacon interval subsequent to the first beacon interval; and upon receipt of an announcement traffic indication message (ATIM) from the second wireless station during the awake window, transmit an acknowledgement to the second wireless station, and stay at the active mode to communicate data with the second wireless station.