I only use XP and have two laptops, are you using a laptop or a pc? Is it a case that you want it to sleep when you stop using or is it a case of when you close the lid on your laptop? Is the roter connected wireless or by lan cable? sorry for the questions next thing i would try is to go to device manager, right click on the lan connection or wireless card and go to properties and see if you have wake on lan selected, disable it by chlicking the check box and that should resolve your problem. I am sure that Vista and Xp are similar in the way to geto device manager.