I've been wondering this for a long time. I like to wait until the thing actually sleeps before I start tossing it around, in order to prevent damage to the spinning hard drive. But it takes anywhere from 90 seconds to 2 minutes after closing the lid for the light to start pulsing. It seems all of my Apple laptops have done this. Why don't they just sleep almost immediately after closing the lid? What is it doing?? Is there anyway to speed up this process?