Current mood:

annoyed

How do I tell what's keeping my Mac awake?
I've noticed in the past month or so, my iMac never sleeps anymore. The display goes off, but it doesn't actually go to sleep. I thought it was because of Connect360, but I checked and 'Prevent system sleep while Connect360 is active' is not actually on. My Energy Saver settings are fine; they're set to display off after 10 minutes and sleep after 15 minutes.

I can tell it's not happening - I'll go away for lunch, come back in an hour and the little sleep light isn't pulsing, and there's no little lag like it's waking up. This is a big problem. I leave my computer on overnight a LOT to download torrents. Usually, it'd go to sleep if everything had finished downloading or seeding, but even if nothing at all is active, it doesn't go to sleep. That is particularly worrying - we've had a huge increase in our powerbill. We thought it was leaving the Xbox 360 plugged in so now we unplug it from the wall when finished with it, but that barely made a difference. I'm thinking it's the Mac not sleeping.

It doesn't go to sleep when logged into my account, which is always running Camino, iCal, Mail, Stattoo and Adium, plus in the menubar, Connect360, Last.fm and the Western Digital Drive Manager. It doesn't sleep on my mother's account either - same Energy Saver settings, but her open apps are Mail, Stattoo and some solitaire game. Plus WD Drive Manager and I think Connect360 runs on her account too. This makes me think it's some kind of background process OR that perhaps its the external WD MyBook keeping the Mac awake. That would be a problem - my torrents download to it, so I can't just unplug it on those downloading nights.

How should I go about tracking down the reason my Mac's not getting its beauty sleep?