Why your Mac sleeps while running Blender
Blender renders, physics simulations, and texture bakes are CPU/GPU intensive but don't request sleep prevention from macOS. A multi-hour render that gets interrupted means starting over.
macOS tracks idle time based on mouse and keyboard input, not CPU or app activity. If you're not actively moving the mouse while Blender does its thing, the idle timer counts down and your Mac sleeps.
Keep your Mac awake with Shake It On
Shake It On moves your mouse slightly at regular intervals, resetting the idle timer. It only runs when your conditions are met, so it activates when Blender is working and stops when you're done.
Best condition for Blender: Only Shake If CPU is above 20%
Quick setup
- Install Shake It On and grant Accessibility permission
- Open Settings from the menu bar icon
- Under "Only Shake If," enable the condition: Only Shake If CPU is above 20%
- Under "Paused When," enable "On battery" to save power when unplugged
- For long overnight operations, enable "Allow display to sleep" in the General section so the screen turns off but the system stays awake
Keep your Mac awake while Blender runs. Smart conditions, $9.99 one-time. Get Shake It On for $9.99 →
Keep your Mac awake the easy way.
Shake It On lives in your menu bar and uses organic mouse movement to prevent sleep. Set it once and forget it.
Get Shake It On for $9.99One-time purchase. No subscription. Free updates forever.