You can certainly use Amazon's Alexa to turn on some devices, but that support is frequently limited. What if a device is in a low-power state and won't respond to your hue and cry? Amazon now has a solution. It recently added a "wake-on-LAN" control method that can turn on sleeping connected gadgets in the home that otherwise won't respond to voice control. Device makers just need to craft Alexa skills that use the new control to have it turn on TVs and other hardware on the local network.