I know it's a stupid question but i only got my mac a few months ago and i was wondering what exactly is sleep mode. I was told to use it rather than just tern it off because, "Do you shut it off every night? OS X needs to perform maintenance in the early hours of the morning.Better off just putting it to sleep." Does it stop the processer. Will applications still run in the background (Torrents). Will it use up much power. Are there any Advantages (Is that statement true? Does it need to update?) Should i just switch it off. Thanks.