Quick answer
Check macOS sleep settings - turn off "prevent sleeping" options
Disable Exclusive Fullscreen Mode in Luna Secondary preferences
Use Command + Tab to return to macOS and manually sleep
Quit Luna Display on both Macs if sleep still doesn't work
Remove from Login Items if Luna auto-opens on boot
😴 Why Won't My Secondary Mac Sleep?
If your secondary Mac isn't going to sleep while using Luna Display, a few macOS settings may need to be adjusted. Here's what to check:
⚙️ Check Your macOS Sleep Settings
⚙️ Check Your macOS Sleep Settings
On macOS Ventura or later:
Go to Apple Menu > System Settings > Battery > Options…
Turn off: "Prevent automatic sleeping on power adapter when the display is off."
On macOS Monterey 12:
Go to Apple Menu > System Preferences > Battery > Power Adapter
Turn off: "Prevent your Mac from sleeping automatically when the display is off."
🖥️ Turn Off Exclusive Fullscreen Mode
🖥️ Turn Off Exclusive Fullscreen Mode
Disabling Exclusive Fullscreen Mode makes it easier to return to macOS and put your secondary Mac to sleep.
Quit Luna Display on your primary Mac
Open Luna Secondary on your secondary Mac
Click the Luna Display menu (top-left corner) and choose Preferences
Uncheck: "Exclusive Fullscreen Mode"
Quit and reopen Luna Secondary for the change to apply
Once Luna is open again, use Command + Tab to return to macOS and manually put your Mac to sleep
🔧 Still Not Sleeping? If sleep mode still isn't working, try quitting Luna Display on both Macs when not in use.
Our team is actively working on improving sleep and wake behavior. Thanks for bearing with us!
💡 Extra tip: If Luna reopens automatically when your Mac boots up, you can remove it from System Settings > General > Login Items to prevent it from interfering with sleep mode.