If you don't want to install an application, you could type something like pmset -g log|grep -e " Sleep " -e " Wake " And get the same results (although a

If you don't want to install an application, you could type something like pmset -g log|grep -e " Sleep " -e " Wake " And get the same results (although a bit harder to sift through) (source: http://apple.stackexchange.com/questions/52064/how-to-find-out-the-start-time-of-last-sleep http://apple.stackexchange.com/questions/52064/how-to-find-o...)