As a follow up on my article last week, Wired features a nice and funny story. It researches deeper on the result of working for a company servicing US clients.
The authors claims that night shifts:

• detoriate family relationships
• supports "extramarital affairs"
• assuming a foreign accent for long periods causes sore throats
• let employees suffer from constipation and acid stomach
• are evil in general
• are the reason for war in the world
• and are really, really not good :-)

Note: The last three points are not directly mentioned in the article!

Well an attrition rate of 40% per year and absenteeism of 5-8% are not really surprising. Although nobody says it's healthy to work during the night, day time operations do fight with the same hassles in India.