The comedy of errors, Humshakals directed by Sajid Khan has been shot extensively in London and Mauritius.
Well, what we hear is that the permission for one of the locations was such that they had to shoot at night and then continue shooting early morning! Hence, on one of the nights, Saif shot till 4am and then again had to start shooting at 9am.
It was thus natural for our Nawaab, Saif Ali Khan to feel sleepy in the morning. We also learn that the vanity vans were parked about 2 blocks away and hence Saif decided to take a nap in one of the taxis instead!
And obviously, knowing what a prankster Sajid Khan is, he couldn't resist clicking a photo of Saif!