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Need to sign and return a PDF? By BY GEORGE GORDON/Computer Guru - | Apr 30, 2021 Sleep or turn off? In my last article, I mentioned that updates occur during the night, so it’s best to never shut off your computer. Now the next question is to put it to sleep or let it go into screen saving mode? Well, putting your Mac to sleep will turn off the display, which also increases the life of the display. It uses more energy while awake than asleep. When your Mac is sleeping, it will still do some maintenance, checks and upgrades, but in a “low power” mode most of the time.