from wiki:
In Windows Vista, 'Stand By' and 'Hibernate' have
been combined into an additional 'Sleep' function which is active
by default. When chosen, this new 'Sleep" mode saves information
from the computer's memory to the hibernation file on disk, but
instead of turning off the computer, it simultaneously enters
Standby mode. After a specified amount of time (3 hours by
default), it shuts down (hibernates). If power is lost during
Standby mode, the system resumes from the existing hibernate image
on disk. Sleep mode, thus, offers the benefits of fast suspend and
resume when in Standby mode and reliability when resuming from
hibernation, in case of power loss. Also, in earlier Windows
versions, drivers sometimes prevented Windows from entering or
reliably resuming from a power-saving state. Windows Vista
ensures the availability and reliable resuming from any power
state. Applications can disable sleep idle timers when needed such
as when burning discs or recording media. Away mode, which is not a
power plan by itself but a feature, automatically turns off
displays, video rendering and sound but keeps the computer working
when the user is away from the computer. Optionally, it can also
transition to sleep mode. Power settings are also configurable
through Group Policy.
paiseh, bo time, explain, read up ba.