Hi, Everyone. Sorry for yet another 'Lion won't sleep' thread. But I gotta ask this. Like everybody else, I also noticed that my 2011 macbook pro does not sleep automatically. Since then, I tried everything to fix the problem. I disabled internet sharing, auto-synching option in the chrome browser...etc. But, I was still having random no-sleep problem. Today I found out that my laptop does not sleep only when the browser is open with a couple of specific websites. These websites are Twitter and Steep & Cheap. Can anyone tell me why these websites prevent mine from auto-sleeping? I was kind of glad that I was finally able to locate the problem but I have no idea why the issue has to do with specific websites. Thank you.