I have a first generation Apple TV. I know the new one uses either pairing or Home Sharing. With my original Apple TV I set my iMac so that the display will go to sleep but the computer does not, neither does the hard drive, and iTunes is running. This way I can always access content from iTunes on my Apple TV to stream movies, etc. My question is whether I should adjust my settings. If I tell it to put the computer to sleep as well and to put the hard disks to sleep when possible, does the Apple TV have the ability to wake the iMac/hard drive to access content?