Here is how south asia looks in night, as is shown by NASA’s Visible Earth catalog on www.daylightmap.com. This website offers the view of different parts of world at different times in a day. It implements Goolgl Maps API. By default, it gets the system date and shows your timezone with present day time view but you can customize time and date by clicking on options menu, which is present in form of yellow side bar on right.
If it could had been incorporated by Google in its Google Earth, it had been much better.
Here is the view of South Asia in night –
To know more about it, click here.