Developed by Amit Agarwal from Digital Inspiration, SleepTime.org is a simple yet clever tool that tells you when your favorite Twitter celebrities or friends sleep. This may sound rather creepy but it actually works accurately to a certain extent. The system analyzes the past tweets of a user and when he or she stays least active on Twitter. After which, the algorithm will then determine his or her sleeping schedule and display it in a sleep chart.
However, the results won’t be accurate if you only publishes a few tweets a day. Another likely reason for your sleep chart to appear way off the mark is due to the settings of your time zone. You’ve to specify the correct time zone in your Twitter account settings.