The Mac thinks that it was woken by pressing on the keyboard or the trackpad.
The Mac thinks the power button was pressed causing it to wake up.
Causes are unknown, but expecting it to be something related to "Real Time Clock" performing an automated wake.
Typical timed maintenance wake as part of "PowerNap". Can be disabled by unselecting "Wake for maintenance" in the settings window.
Believed to be "Airport" triggered maintenance, Airport was the brand name of Apple's Wifi, until they simply called it "Wifi". Read Network Wakes for suggestions on how to prevent these.
Believed to be "Bluetooth" triggered wake. These appear to go away when applying one of the following. Read Bluetooth Wakes for suggestions on how to prevent these.
Believed to be when the lid of the Laptop is opened. These is currently no way to prevent opening the lid from waking the machine.
Currently unknown as to the causes of this event.
Believed to be an external device connected to the Thunderbolt port, a device connected to a Thunderbolt dock or connected to a Thunderbolt Display.
Believed to be "Ethernet" triggered maintenance, from a Ethernet adaptor running over Thunderbolt (such as the built-in adaptor to the Apple Thunderbolt Display). Read Network Wakes for suggestions on how to prevent these.
Believed to be caused by the Mac receiving a "Notification" and displaying it in the top right hand of the screen. Read Notification Wakes for suggestions on how to prevent these.