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Sleep mode, stand by, and hibernation, all refer to a low power mode for electronic devices such as computers. Waking up resumes normal operations.
In computing, the standard for power management is ACPI.
Whilst Sleep mode (or Stand-by mode) is supposed to place electronic devices into a state of "waiting for a power-up" command, some devices (mostly televisions) in this state actually consume approximately 1/3 of the power required during full operation.
A new incentive "Eco-mode" is being pushed by environmental groups and the British Government is seeking a "One-Watt" sleep-mode. It remains to be seen whether or not this effort will show results, however some manufacturers are themselves incorporating this "One-Watt" mode in their devices.
In July 2006, the British Government announced it would outlaw standby mode on televisions and video players. It was found that standby modes on electronic devices accounts for 8% of all British power consumption.
Panasonic's latest Receiver/Amplifier (with THX-2) which can consume up to 430 Watts whilst powering seven speakers, has a 0.5 Watt standby mode.
See also
Notes
"Sleep mode"