Can someone please explain to me how OS X handles its sleep behaviours? It sleeps even when I have applications actively running... why? I set it to never sleep, but when it woke up this morning (by settings), I wasn't there, and eventually, instead of just going to screensaver, it slept. I clicked the mouse, the log in screen appeared, I logged in, then the screensaver appeared and I had to unlock the computer again. Whaaa'? I'd really just like to know how to prevent the Mac from sleeping when applications are actively running (like BitTorrent downloads, for instance). Thanks in advance.