Sleeping Time Tells You When Twitterers Sleep
Posted on March 24, 2010
Sleeping Time is a Twitter tool that determines a Twitter user's sleeping schedule based on when they tweet. In the example above, Sleeping Time determined that Martha Stewart sleeps about six hours a night and that she is an early riser.
That sounds like it might be about right as she is known for being an overachiever and for not needing a lot of sleep. You can type in the username for any Twitter user and it will tell you when they sleep. Only public Twitter accounts are indexed by Sleeping Time.
Note: This may be less effective now that users can schedule tweets.