About "Sleep" and "Deep Sleep"

When you select the Sleep command in Mac OS (or when the computer goes to sleep as a result of Energy Saver settings), as many components as possible will enter a low-power mode.

If all hardware components and connected peripherals are in a low-power mode, your computer is in "deep sleep". However, not all hardware components and peripherals are capable of running in a low-power mode.

If one or more hardware components or peripherals does not enter a low-power mode, your computer may simply sleep.