Sleep modes in OS X are designed to save power by shutting down unnecessary and power-hungry system components; however, there may be times after an update or other configuration change when the system hangs or otherwise malfunctions after being set to sleep.
OS X has two main sleep modes. The first is standard sleep, in which the system keeps the contents of its memory active by providing power only to the RAM chips. This allows quick wake-up times but also draws a touch more power as it requires uninterrupted power to maintain RAM contents. The second mode is hibernation, in which the system will write RAM contents to disk, after which the entire system can be shut down. This mode requires longer wake-up times as RAM contents are restored, but will save the most energy.
All Mac systems support both sleep modes, though by default desktops are set to use the first, "standard" sleep mode and laptops are set to use the hibernation mode.
These options for setting the sleep modes are stored in the Mac's System Management Controller (SMC), which is the unit responsible for handling hardware during power-related events such as startup and sleep. Hence, if your system is running slowly or hanging during sleep events, then the first step would be to try resetting the SMC or at least checking its values. To do this, open the Terminal utility (in the /Applications/Utilities folder), and run the following command:
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