Shared device / wireless network security

Past couple days... my daughters SLEEPING MBP has appeared on my MBP as a shared device. How is this possible if it's sleeping?
Perhaps there's a good explanation for this, but I'm concerned about it.
She connects via wireless to our home D-link wireless router.
Wasn't sure where to ask question on boards... help appreciated.
Thanks.
David Stamm

Here are the relevant System Preferences Mr. Stamm:
To enable "wake" from a remote system (Note this feature may not work with non-Apple routers, so it's good to know it works with your D-Link):
To enable screen sharing, file sharing etc ("Remote Management" encompasses Screen Sharing):
Connecting to your system from another one, for purposes of screen sharing or copying files (screenshot is from Lion):
If you do not want your password field to automatically populate, just deselect "Remember this password..."
In summary:
You always need a name and password
Your name and password are secured in OS X's Keychain (with your consent)
You can enable or disable any or all of these features
None of your shared devices or computers may by reached from outside your LAN (without using other utilities)
I hope this helps assuage your concerns.

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