A little context, he is the previous CEO of NITI Aayog, the "company" in question.
Niti aayog is a government owned think tank/ company whose purpose it is to do bring and do feasibility studies of possible government policies. The person is a civil servant and this was his previous job.
The company isn't a multi-billion dollar company, it's basically the government, that too under the bureaucratic wing of the government.
Blackout curtains have different levels. From your comment it seems to me you probably tried 100% blackout curtains. Those are quite overkill.
You should try 80% blackout curtains, they block almost all of night lights and have a warm yellowish haze during the day.