Sony PCG-XG18 Primary User Manual page 55

The computer saves the current state of the system in RAM and switches
off power to the CPU. The red power indicator light flashes in this mode.
Press Fn+Esc, or press the power button and release it immediately. You
can also use the PowerPanel utility or the Jog Dial control to enter System
Suspend mode.
Press any key or the Power button for less than 4 seconds.
The state of the system is saved on the hard drive and power is turned off.
The power indicator light is off in this mode.
Press Fn+F12. The "Save to Disk Manager" screen appears, and then the
computer enters System Hibernation mode. You can also use the
PowerPanel utility or the Jog Dial control to enter System Hibernation
mode.
Turn on the computer by pressing the power button. The computer
returns to its previous state.
Time to return to normal mode
System Idle requires less time than System Suspend, and System
Suspend requires less time than System Hibernation.
Power consumption
System Idle uses more power than System Suspend, and System
Suspend uses more power than System Hibernation.