I've been trying to figure out for a little while what wakes my iMac up. Last night I plugged the iMac directly into the wall and removed the status cable from the APC so it doesn't communicate with the iMac. I put the iMac to sleep and it slept until I woke it this morning. Normally I'd get up, hit the space bar 'wake' it up to find it was already awake (IM logged in, WLAN connected). When it normally comes out of sleep I can see it connecting to the WLAN via the icon in the upper right, and I can see Adium log off (because it slept all night) and re-log in. So far, so good. I've also had it where I put it to sleep at 9am, and by 9:15 when I'm at work I log into my AIM/MSN client and it tells me I'm logged in elsewhere.. and sure enough the iMac is awake at home. So far, so good. iMac is still sleeping at home. What good is a UPS if you cannot use it and not lose other functionality?