Mac Os X App Prevent Sleep

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Your Mac will go to sleep after a specified duration of inactivity, automatically. You can also put your Mac to sleep when you choose Apple Menu > Sleep. You can change your computer’s sleep settings by going to System Preferences > Energy Saver, so that you can tell your Mac how long to wait before it goes to sleep. Are you having problems where macOS won’t go into sleep mode when expected? This article explains how you can troubleshoot it. So why your Mac is not sleeping.

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It is important that your Energy Saver settings is set up the way you want. You can check this by going to System Preferences > Energy Saver.

1-First let’s try to figure out what is preventing your Mac from going to sleep. Some internal activities may keep your Mac wake. For example, several users have said that their printers (e.g., pending print jobs) cause this. Here is how you can see this:

Aug 02, 2017  Users can even disable sleep when the system is idle and keep it awake indefinitely. There are apps that will let you prevent your Mac from going to sleep. If you don’t want to keep you Mac awake indefinitely, rather just for a short period of time, give Lungo a spin. It’s a free menu bar app that lets you temporarily disable sleep on macOS. Which popular apps prevent sleep on Mac OS X? Ask Question Asked 8 years, 2 months ago. Active 7 months ago. Viewed 3k times 2. The main reason a Mac won't go to sleep is because of a 3rd party app. If there was a list of popular apps that have been known to cause sleep issues, it would make debugging this issue easier. Apr 23, 2019  This column indicates what processes prevent your Mac from going to sleep. As you can see below, iTunes is keeping the Mac wake, meaning it is interrupting Mac sleep mode. Because iTunes is open. Try closing this app. As long as this app is open, the Mac will not go to sleep automatically. Aug 03, 2012  To temporarily disable sleep functions regardless of sleep settings, run the following command from Terminal in Mac OS X: caffeinate. At the core basic function of the command, caffeinate is all that’s necessary, and while caffeinate is active sleep will be prevented until it’s no longer running. Dec 27, 2013  OS X 10.8 Mountain Lion notification center integration; Sensor sensitivity and accuracy fine-tuning; Modular development approach (more sensors on the way) Should I Sleep is available for download from the Mac App Store. It includes the face-detection sensor and manual-timer mode.

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  • First launch the Activity Monitor app (Applications > Utilities) or you can open Spotlight (Spotlight not working?) and search for it.
  • Click the Energy pane.
  • There are five or six column and and one of them is called “Preventing Sleep”. This column indicates what processes prevent your Mac from going to sleep. As you can see below, iTunes is keeping the Mac wake, meaning it is interrupting Mac sleep mode. Because iTunes is open. Try closing this app. As long as this app is open, the Mac will not go to sleep automatically.

2-You can also use the Terminal app to determine the cause of sleep prevention. Here is how:

  • Launch the Terminal app (Applications > Utilities)
  • And enter the following command and hit enter:
  • pmset -g assertions
  • And read the results. It will produce something like this:

Assertion status system-wide:
BackgroundTask 0
ApplePushServiceTask 0
UserIsActive 1
PreventUserIdleDisplaySleep 0
PreventSystemSleep 0
ExternalMedia 0
PreventUserIdleSystemSleep 1
NetworkClientActive 0

Try to find items with a “1” next to them. As you can see PreventUserIdleSystemSleep has 1 thus it is enabled. Check under the “Listed by owning process” line. The results will also give more details, as you can see below:

Listed by owning process:
pid 12558(iTunes): [0x00009cf70001a498] 00:00:12 PreventUserIdleSystemSleep named: “”
pid 157(coreaudiod): [0x00009cf70001a48c] 00:00:12 PreventUserIdleSystemSleep named: “,0,1,1:0.context.preventuseridlesleep”

This explains that iTunes is the cause.

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3-If you are still having issues, try resetting NVRAM or PRAM. Resetting NVRAM and PRAM are same. Some display settings are stored in NVRAM and resetting this may resolve your issue. Here is how:

  • Turn off your Mac
  • And turn on your Mac and immediately press and hold the Option, Command, P, and R together for about 20 seconds. Your Mac will look like restarting.

4-Still no luck? Then reset SMC on your Mac. Resetting SMC is more complex than resetting NVRAM. Apple documentation clearly explains this process.

If you are still having issues, you may want to contact Apple.

See also: How To Troubleshoot Screen Flickering

Sleep or wake your Mac

When your Mac is asleep, it uses much less energy than when it's awake, and waking a Mac from sleep is much faster than turning it on and waiting for it to start up.

Put your Mac to sleep

  • Choose Sleep from the Apple menu .
  • On a notebook computer, close the lid.
  • Use a sleep keyboard shorcut.

Wake your Mac from sleep

  • Press a key, or click your mouse or trackpad.
  • On a notebook computer, open the lid.
  • Briefly press the power button.

Change Energy Saver settings

Choose Apple menu  > System Preferences, then click Energy Saver.

Mac notebook computer

Mac desktop computer

Availability of each setting depends on your Mac model and version of macOS.

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Allow power button to put computer to sleep
Allow your Mac to sleep when you briefly press the power button.

Automatic graphics switching
Allow your Mac to automatically use its lower-power graphics chip for low-intensity tasks such as text editing. Learn more about setting graphics performance.

Battery Health
Learn about battery-health management.

Computer sleep
Set how long your Mac must be idle before it automatically goes to sleep.

Display sleep
Set how long your Mac must be idle before it automatically stops the video signal to the display and puts the display to sleep, causing it to become dark or turn off. If the display has a power indicator, it might show that the display is in low-power mode.

Enable Power Nap
Allow your Mac to perform certain tasks while sleeping, such checking email, receiving Calendar updates, updating software, or making Time Machine backups. This uses more energy than when your Mac is fully asleep, but less energy than when it's awake. Learn more about Power Nap.

Optimize video streaming while on battery power
When playing high dynamic range (HDR) video while on battery power, play the video in standard dynamic range (SDR), which uses less energy.

Prevent computer from sleeping automatically when the display is off
Prevent your Mac from sleeping when the display is turned off or goes to sleep.

Put hard disks to sleep when possible
Allow the motor of a traditional hard disk to turn off after a period of inactivity. This doesn't affect solid-state drives (SSDs), which have no moving parts. If using a traditional disk with certain pro media apps or other apps that prefer uninterrupted access to the disk, you might want to deselect this setting.

Set a daily schedule for putting your Mac to sleep or turning it off or on.

Shutdown options
Set your Mac to shut down based on conditions that apply when your Mac is drawing power from an uninterruptible power supply (UPS).

Slightly dim the display while on battery power
Allow your Mac to save energy by slightly reducing the brightness of the display while on battery power.

Start up automatically after a power failure
Allow your Mac to automatically start up when AC power is restored after a power interruption.

Turn display off after
Similar to ”Display sleep,” above.

Wake for network access
Allow your Mac to automatically wake when another device accesses its shared resources, such as shared printers or Music playlists. Some of these tasks might prevent the computer from sleeping when idle.

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You can also save energy by adjusting your display’s brightness and the brightness of your backlit keyboard.

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Learn more

After several hours of sleep, your Mac can save more energy by saving its state to the startup disk, then turning off power to some components, such as RAM. This extends the length of time that Mac notebook computers can stay asleep while on battery power.

It also helps prevent you from losing work if your Mac loses power while asleep, such as after the battery runs low. In that case, plug your Mac into AC power, then press the power button. You might see a progress bar onscreen as the previously stored contents of memory are copied from the startup disk:

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Learn what to do if your Mac doesn't sleep or wake when expected.

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