It's not a big deal, but I've noticed many times when I open up my MBA, the computer is frozen for 15-20 seconds. The clock displays the time the machine went to sleep. It's not a big deal and I've seen a number of posts reporting the same behavior. I've also noticed that when asleep, PowerNap doesn't 'do it's thing'. It's supposed to retrieve mail, but it doesn't. Again, it's not a big deal, since it takes 3-4 seconds to get mail. I am posting, since, well, it's not working the way it's supposed to. I know it's a (very) minor feature, but does it work properly for anyone? Thanks!