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Why 2012 iMac/Mac Mini Powers Off after Hours of Sleep (Hibernates/Turns Off)
An updated Apple support article today (Mac computers: Progress bar appears after waking from sleep) explains why newer Macs (including Late 2012 mini and iMacs) go into hibernate (and power off) after hours of sleep even when on AC power. Per the Apple doc, added in OS X 10.8.2 supplemental update 2.0 to comply with European Energy Standards.
   I had mentioned this behavior in an article on HDMI tests with a late 2012 mac Mini last fall (which also covered other things) and linked to an Apple forum thread on it ("Mini hibernates despite pmset saying it shouldn't") that discusses changing PMSET options.
(Tip: from the Terminal, try "sudo pmset autopoweroff 0" and "sudo pmset standby 0".)
BTW: This is for later Macs that support Standby. [Before Disabling BOTH autopoweroff and standby, I'd tried setting both autopoweroffdelay and standbydelay from the default 4200 (seconds) to 86400 (i.e. 24 Hours).]
(Update - from 4/4/2014 mail in reply to news post on new Mac Pros also turning off in sleep)
"Re: About Modern Macs Not Waking after Hours of Sleep
No idea why, but I've now seen at least 2 cases where "sudo pmset autopoweroff 1" and "sudo pmset standby 1" worked but "sudo pmset autopoweroff 0" & "sudo pmset standby 0" didn't!?
(What mac models and OS X version were those 2 using?)
-BDAqua"

Agreed that does seem odd (opposite of expected setting), but if any readers find that helps (where 0/disabling didn't), let me know.
(previous/older posts follow)

FYI on sleepimage file (created by hiberate):
If your Mac goes into hibernate and you don't plan to ever let that happen again (i.e. with desktop macs) you can save Gigabytes of disk space (especially important for SSD users) by removing the "sleepimage" file written when the mac hiberates. (This was covered here years ago in a 2009 post Tips for OS X SSD Users on Disabling Hibernate mode/deleting sleepimage file.) The sleepimage file is written to the /var/vm/ directory. Using the Terminal, cd to that directory and sudo rm the file to delete it. (Size of the Sleepimage file depends on amount of RAM installed.)

(Update) Sleepimage File Keeps Reappearing despite Hibernate Disabled:
I just noticed this recently (mini w/Mtn Lion 10.8.4) but I hadn't checked earlier for the sleepimage file 'reappearing' after deleting it. Regardless of hibernate mode being disabled and deleting the sleepimage file, it will later reappear. Deleted it via sudo rm (file located in /private/var/vm/ or /var/vm/) - ls check shows file is gone. I verify (via pmset) that hibernate mode is disabled yet the sleepimage file reappears - even if the mac had not been in sleep at all. In fact, I noticed the file was recreated again after a few minutes. (System/drives, even Display were set to never sleep - deleted the Sleepimage file, let the mini sit idle for 5-10 minutes (no wifi/internet connection active, only the terminal open). Checking /private/var/vm/ again showed the sleepimage file was back (with a new timestamp.)
My first thought was to create a small sleepimage file and write protect it, but curious if anyone has a better suggestion. (For now I'm just leaving it alone.)
  

Apple/products related News/Reviews/PR/Op-Ed/Apps/SW Updates:


  
New/Updated Apple Support/How-To/Troubleshooting Articles:


  
Recent Articles/Tips/Tweaks/Reviews:
Listing/links of updates to mod/upgrade articles, tips and reviews you may have missed. ($250 Mac Pro Dual 3.2GHz Quad-Core CPU Upgrade, DIY Fusion drives, Low-Cost 2006 Mac Mini CPU Upgrades/unofficial EFI updates, 2012 Mac Mini HDMI video problems/display tips/USB 3.0 interference, mods and more)

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Previous Day's News Summary:
    Wednesday Feb. 27, 2013 News Archive
  • Leap Motion Controller Launches May 13 for $79.99
  • Double your Mac mini, MacBook, or MacBook Pro's Capacity
  • Amazon: Download Cloud Player for iPad, but don't download iOS Kindle update
  • Amazon warns iOS users to not update Kindle app due to glitch
  • VirnetX v. Apple judge upholds $368M patent suit verdict
  • What 'New Categories' Could Apple Be Considering?
  • Tim Cook on 2012: 'We had the mother of all years'
  • Spotify iOS Update Revamps Interface, Fixes Bugs
  • Meet the Common Man's Robot: Romo
  • New/Updated Apple Support/How-To/Troubleshooting Articles:
    - Complete List of Apple Thunderbolt cables and adapters
    - Mountain Lion: About Power Nap
    - Mac Basics: Set your preferences
    - About Windows Migration Assistant
    - iTunes 11: Frequently used features
    - iTunes in the Cloud and iTunes Match Availability
    - iTunes and iOS: Change the name of your iPhone, iPad, or iPod
    - iOS: Understanding Notifications
    - iOS: Troubleshooting Personal Hotspot
    - iOS and iPod: Syncing photos using iTunes

For links to older news pages, see the Archives.
  

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