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By default, your Mac is set for maximum efficiency. That means it tries to preserve energy whenever and wherever it can, especially if you’re on battery power. So when it detects that you’re no longer using your computer, it automatically goes to sleep.
While that will save you some battery life, it’s not ideal in every situation. You might, for instance, be gone only for a few minutes and want to resume instantly when you return. Or worse, if you’re waiting for an active task like a large download to complete, your computer might interrupt it by going to sleep.
Mac - Asleep
Thankfully, you can manually configure your Mac to keep it from falling asleep.
macOS has a built-in tool to customize how long your computer should wait before turning off the screen and going to sleep.
Energy - Saver - System - Preferences - Bunch
It’s present as Energy Saver in System Preferences. In there, you will find a bunch of settings for personalizing the sleep times for both when your Mac is on battery power and when it’s plugged in. You can set a minimum period of one minute and even push the slider up to Never if you want to disable the automatic behavior entirely.
Plus, Energy Saver has a couple of more handy options. You can switch on a utility called Power Nap where even in sleep mode, your Mac will periodically check for new emails, appointment alerts, and more. When it’s connected to a power adapter, your Mac can also just turn off the screen and not go to sleep.
Energy - Saver - Mac - Hours - Schedule
Energy Saver even lets you schedule your Mac’s hours. By hitting the Schedule button located at the bottom of the window, you can specify the time when the computer should start up or wake and another parameter for when it should go to sleep, shut down, or restart.
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