Why Windows Sleeps during active internal Process ?

I have a application using Delphi on Windows. There are some lengthy internal processes that can take few hours.
If no user is physically using the machine it goes to sleep mode. How do I notify windows that it is not idle and that I am processing.
I would prefer not to trap sleep/hibernate and inform windows every 5 mins that I am processing.
Allan_FernandesAsked:
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rindiCommented:
Why don't you just disable sleep / hibernate?
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Allan_FernandesAuthor Commented:
I have saveral customers using my application. Not possible to ask them to remove the Sleep mode.
Also I want their machines to sleep after my process is done.
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Sinisa VukCommented:
- for older XP - put TApplicationEvents component an check for message WM_POWERBROADCAST  with parameter: PBT_APMQUERYSUSPEND.
similar - old EE question
http://www.delphipages.com/forum/showthread.php?t=187856
 -for vista, 7, .. put timer and from time to time call SetThreadExecutionState function....
how-to-prevent-hibernatesuspend-on-a-desktop-in-vista
SetThreadExecutionState function
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