Yesterday I did a clean install of Mac OS X Lion on my MBP 13", medio 2010. I have noticed that it, in case of inactivity, takes longer time doing into computer auto-sleep than I have chosen in Energy Saver in Preferences. If I set computer sleet to 1 minute, in really takes 6 minutes. 5 minutes takes 7 minutes and 10 takes 12 minutes. Why?