How to remotely "wake up" a Mac in order to screen share in iChat?

Apologies if this is not the right forum for this question.
I help my mother-in-law (81yrs) to maintain her computer (upgrades and all non-daily activities that she does not want to bother with) by remote Screen Sharing through iChat. This now works quite well.
However in order to screen share, her computer must be constantly ON, i.e. not be in sleep mode. Is there a procedure which would allow her computer to be turned into sleep mode after a certain amount of inactivity, but then be "woken up" remotely in order to do screen sharing?
Thanks in advance for any advice/suggestions/pointers.
Cheers from the Austrian mountains.
Veit

Thanks, Andy.
In another forum http://discussions.apple.com/thread.jspa?threadID=1340923&tstart=0 we found perhaps not the ideal solution, but a workable one.
Cheers,
Veit

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