Hi, I am using an up to date version of Mountain Lion on a 13" MacBook Air 2012. When the laptop wakes from sleep and I am ready to put my password in, the keyboard doesn't activate for another 3 or 4 seconds after the log on screen appears. Is this normal? I don't recall it happening before I updated from Lion. Thanks. PS sorry if this question has already been answered, I did a search but couldn't find anything.