Chalk another one up for sloppy work from Apple. Now iTunes continues to think a device is connected to it, preventing iMac from going to sleep mode. I sleep all the ATV at home. Turned off iPhone, iPads and Macbook Pro. Waited 30 min and still iTunes Home Sharing thinks a device is connected. Hilarious!!! Yeah quit iTunes and reboot the Mac will resolve it...temporarily. I've done this a few times and eventually ITunes Home Sharing will again think a device is still connected. Preventing the iMac to sleep and save power.