Hi Two things: 1) if the "allow devices to wake from sleep" option is greyed out then your bluetooth software is not up to date. go to the apple website and download the bits at http://docs.info.apple.com/article.html?artnum=120275 http://docs.info.apple.com/article.html?artnum=120276 or here if you're on jaguar still http://www.apple.com/support/downloads/bluetoothupdaterformacosx1028.html however, you can only update later versions of the Dlink BT dongle 2) i have the wake from sleep option active and it does work well sometimes. however, sometime it goes into this weird cycle of waking and then sleeping again, i assume as a result of erratic mouse behaviour. anyone else experience this? thanks matt