How to Disable Sleep Mode on a MacBook (8 Steps)

Click on the 'System Preferences' icon in the dock on the bottom of the screen.
Click on 'Energy Saver' (lightbulb icon) in the System Preferences window.
Click and hold the slider on the sliding scale labeled 'Put the computer to sleep when it is inactive for:' and slide it all the way to the right, to 'Never.' This sets the sleep preference for your current power source, either battery or power adapter.
Click on the drop-down menu labeled 'Settings for' at the top of the window, and select the power source you are currently not using. Then repeat step 3. This will ensure that your Macbook will not go to sleep on its own whatever power source you are using.
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How to Change the Sleep Mode in Mac

Go to the 'Applications' folder and double-click 'System Preferences.' Select the 'Energy Saver' icon.
Adjust the 'Computer sleep' and 'Display sleep' slide bars to change the time when the computer will go into sleep mode. If you are on a portable, use the tabs at the top of the screen to adjust the sleep mode times for when the computer is running from the battery or the power adapter.
Click the 'Schedule' button and enter a specific time for the computer to wake up or sleep, if desired.
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