Readme for EHCISleepEnabler
To enable it you have to edit the Info.plist in
/System/Library/Extensions/IOUSBFamily.kext/Contents/PlugIns/AppleUSBEHCI.kext/Contents/
You need to add these lines
<key>OSBundleCompatibleVersion</key>
<string>1.0</string>
under
<key>CFBundleVersion</key>
<string>3.1.5</string>