Xbox comes with a feature that allows users to wake up the console by just saying “turn on Xbox”.  But in order for this feature to work, the console has to be at least in stand by mode all of the time.  Depending on where in the world the console is sold, this feature is delivered as the default setting.

But the best thing to do is turn off your console when your not using it.  Unplugging it would even save more energy.