Allowing your Mac’s display to go to sleep may lengthen the display’s life. It also saves energy. You can control options like these on your MacBooks and iMacs.
Go in to System Preferences from the Apple menu, and then select Energy Saver.
The top two sliders apply to the amount of time of inactivity before having the entire computer go to sleep or just your display. If you are using a MacBook, you can set up your choices when you use an adapter or when on battery power. When you make your choices by moving the slider to the left or right, the change is instant.
Below, you can checkmark to put hard disks to sleep when possible and wake for network access. I recommend you also checkmark to Show battery status in menu bar.
To the bottom right, select the Schedule button. In the window that opens, you can checkmark when to Start up or wake your computer each day and at a specific time. You can also set a time for your computer to Sleep each day and at a specific time. Click OK after making your choices and then you can close the System Preferences window.
For 15 years, Scott Lindsay has helped tens of thousands of people better their skills, publishing more than 400 articles about Apple and Microsoft software, the computer and the Internet. You can reach Scott for comments or questions at ScottLindsay@live.com.