I travelled by SKS Travels Sleeper Business Class on 13th August 2012 along with my family. Every thing was good for the first 2 hours. Once all passengers slept, they stopped AC and lights are also not working. We complained to the driver. He said, there is an electric problem, so AC and lights are not working. We struggled a lot whole night due to suffocation, couldn't even breath properly, bad smell, sweating, etc.
Surprisingly, by the time we reach destination i.e. around 06:30 AM they switched on all lights.
That is how they operating this bus service. Please do not travel by this bus and experience bad traveling. It's not Business Class, but WORST CLASS :-