I used to be able to leave my MacBook Pro (15'', 2011) on my desk with Home Sharing on. If I left my computer I rarely had issues having the Home Sharing work. Ever since updating to Mountain Lion I've noticed that my MacBook goes into sleep/hibernate mode (I don't know what it's technically called). Pretty much if I don't touch anything on the computer the screen goes black then once I touch a key or trackpad the computer turns back on, finds wi-fi pretty quick, which allows Home Sharing. Is there a way to make this time before sleep/hibernate longer?