System Preferences – Energy Saver – 10.8

The Energy Saver preference has a new addition – Power Nap!

This enables your Mac to check for e-mail, calendar and iCloud updates whilst asleep, which is great, as it saves on syncing time when awaking a machine, the downside however is that it uses more power than the conventional sleep mode, so it’s best to use it only when plugged into the mains.