I gave my Mac Mini insomnia!

I had turned on an external FW CD burner to check the readability of a CD that my granddaughter had found and didn't turn it off. I kept wondering why my Mini was suddenly not sleeping at the appointed interval as set in Energy Saver.

Checked the System log for anything unusual and, lo and behold, I found something I hadn't seen before at right about the time it should have gone to sleep:



That led me to assume that it was something that wasn't playing nice which is when I realized that the power light was still on on the CD burner. I powered it off and the insomnia vanished.

It Gandolfini'ed.
Sorry... couldn't stop myself.

Glad you figured it out, although the usbmuxd message has nothing to do with it. It is simply a message about a USB device being polled or something, and your burner is FW.

I see them all of the time in my Console and most every other Mac I work on. Do a search in Console for heartbeat and see if the messages are still occurring.