Have a friend who is constantly twitting their life away and wondering if he/she ever sleeps? Now you can find out their sleeping time through this cool site: http://www.sleepingtime.org
Basically what this site does (I believe) is that it observes the tweets of a particular Twitter username and periods of inactivity to determine when the user sleeps. Apparently, my sleeping time is from 6pm to 2am 
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