Additionally, choose the Battery tab (and then the Power Adapter tab) on MacBooks. On MacBook with macOS Big Sur, click Battery. On Mac desktop (iMac, Mac mini, Mac Pro) and MacBook running macOS Catalina and earlier, click Energy Saver.Click the Apple logo at the top left and choose System Preferences.However, if you have set it to go to sleep after a long time (say 3 hours) or Never, follow the steps below to change it. Your Mac automatically sleeps after the set time. Your MacBook may have a hardware problemġ.Mac won’t sleep if Spotlight is indexing files.Use Activity Monitor to see apps taking unnecessary resources.Quit apps designed to prevent Mac’s sleep – like Amphetamine.Check Mac’s sharing preferences like printer or hard disk.Stop Bluetooth devices from waking your Mac.Make sure Mac’s sleep settings are correct.Here are the tested solutions to ensure your Mac goes to sleep without any problems. This may affect the longevity of your Mac as sleep mode saves energy when you are not using it. If your Mac doesn’t go to sleep, it could be due to some apps or items meddling with the process.

How to turn on macbook to sleep mode