Understanding sleep modes on MacBook Air

Hi guys. First post here. Just wanted to check if I am missing anything. I have a new Air 15 running Sequoia. First new Mac since a mini in 2013, which is still stuck on Mountain Lion. So first day playing around, I closed the lid between sessions to make it easier to put down, plus protect the screen from knocks. Did this maybe 3 times. At the end of the day I noticed in Activity Monitor that it had written ~50G. Thought this was a lot. Anyway I did a bit of digging on the web and realised that it was going into Safe Sleep, so copying RAM to the SSD on lid shut as a precaution. Confirmed this with "pmset -g | grep hibernatemode" giving value of 3. I've changed it to Regular Sleep with "sudo pmset -a hibernatemode 0" and confirmed that the disk writes now show little to no change between lid shut and re-open. I don't leave docs open/unsaved so I'm really not bothered about the disk backup in case of battery loss, it's almost always on mains anyway, and I can now shut the lid whenever without gigs of SSD writes each time. My understanding is that MacBooks default to mode 3 whilst the desktop Macs default to mode 0, which does makes sense. So this seems to be a solution for me with no downsides. You guys agree with this?


Richie


[Re-Titled by Moderator]

Original Title: Mac Sleep Modes

MacBook Air 15″, macOS 15.5

Posted on Jun 19, 2025 7:49 PM

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3 replies

Jun 20, 2025 4:22 AM in response to RPV69

The default setting on a M3 MBA ruining Sequoia 15.5 are as per below


If as you have said the machines is kept plugged in most of the time


Yes you can change the setting


Just remember, if or when the computer is not able to be connected to a Power Source for an extended period of time


Adjust the pmset setting back again


Where wear and tear of writing the RAM to drive in hibernate mode should be minimal


Though, over and extended period of time ( unknown ) using hibernate mode will have some negative impacts at some time




Jun 20, 2025 4:14 AM in response to RPV69

Hi,


MacBook Airs utilize sleep modes to conserve power when not actively in use.There are a few different sleep modes, including "Safe Sleep", which saves the system's state to disk before sleeping, and "Standby", which provides a longer sleep duration and deeper power savings. You can manage sleep settings through System Settings, including setting a time for automatic sleep or enabling wake-on-LAN for network access. 


Sleep Modes Explained:

  • Sleep:
  • When you put your Mac to sleep, it enters a low-power state, but the system's memory (RAM) remains powered, allowing for a quick wake-up. 
  • Safe Sleep:
  • This mode is enabled by default on laptops and saves the system's current state to the hard drive in addition to keeping the RAM powered. This ensures that your work is not lost if the battery runs out while sleeping. 
  • Standby:
  • This mode, available on certain Macs, provides even deeper power savings by powering down the RAM and only restoring from the saved state on the hard drive when waking up. It's a longer sleep, but with more energy conservation. 

Managing Sleep Settings:

  • Automatic Sleep:
  • You can set your MacBook Air to automatically go to sleep after a period of inactivity.This is managed in System Settings > Battery > Options. 
  • Wake for Network Access:
  • If you need to access your Mac remotely while it's sleeping, you can enable Wake on LAN (Wake for network access). This setting is also found in System Settings > Battery > Options. 
  • Night Shift:
  • While not a sleep mode, Night Shift automatically adjusts the display's color temperature to reduce blue light exposure in the evening, which can help with sleep. 

When to use which mode:

  • Sleep:
  • Use when you're taking a short break from your MacBook and want to quickly resume your work.
  • Safe Sleep:
  • Use when you're concerned about battery drain while sleeping or need to ensure your work is saved.
  • Standby:
  • Use when you want to maximize battery life while sleeping for longer periods. 

Other relevant settings:

  • Prevent automatic sleeping when the display is off:
  • You can prevent the Mac from sleeping when the display is off but the lid is still open, which can be useful when using an external monitor. 
  • Put hard disks to sleep:
  • You can choose to put the hard disks to sleep when possible to further conserve power. 
  • Sharing:
  • If you have sharing enabled, make sure to check your sharing settings in System Settings > General > Sharing, as certain shared services can prevent your Mac from sleeping. 


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Understanding sleep modes on MacBook Air

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