All the energy settings are default Lion, as it shipped. If i let the mini go to sleep on its own - every so often I hear my external hard drives "wake up" (FW400 drives, 1 my book, 1 seagate - & i think it is happening more with the MyBook). Since the computer is in my room, and I have sick kids waking up all night - i hear them often. It *seems* to also do it when I get on my iPad. But, i'm not coherent enough in the middle of the night to sort this out If i go up and select "sleep" from the apple menu, it doesn't happen. Network is wifi, I have an airport in here extending from my TimeCapsule. I don't think "wake on LAN" got enabled anywhere. I run a regular account for myself with a master Admin account. It's obviously NOT the end of the world - but it is annoying and my MBP with the same drives didn't do it.