When do your Twitter friends sleep? If you want an answer to this question, there's When Do They Sleep. It analyses your friends' tweets to give an estimate of their sleeping habit. In my case, it has been able to be very close to my actual sleeping time. I am not sure about how accurate results it gave for others, but it's surely an amusing toy.
A list of Bollywood celebrities on Twitter shows that many of them go to bed at around 10-11pm. And, comedian Cyrus Broacha goes to bed at 10am and gets up at 6pm!
When Do They Sleep