USB activity is a sure way to wake a sleeping Mac, and is the reason why typing on wired keyboards does this. When troubleshooting peripheral devices (especially the mouse and keyboard), set the system to sleep after a short period to prevent long wait times. Though systems generally wake up because of user input (clicking a mouse or typing on the keyboard), there are a number of other ways that a system can be inadvertently awoken. This can be irritating because it wastes power, especially for laptop batteries however, it can also be concerning for those who might wonder if their systems are being accessed. The system should stay in sleep unless specifically commanded to wake however, there are times when the system may randomly wake from sleep. Sleep modes on Mac systems are convenient for saving power while preserving your workflow, and can be set up in the Energy Saver system preferences for various power schemes (batteries, power adapters, and UPS units).
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