The Ashish R Shukla directed film is finally releasing in India on September 27 after garnering praise in film festivals.
The 33-year-old actor, who was born and brought up in Delhi, said the lanes of Prague became similar to his own city as they spent time shooting the film there.
"'Prague' was a difficult but fun film to shoot. We shot it in guerrilla style, capturing interesting parts of the city, its night life and dark alleys. It was my most collaborative film as we all worked together to bring it to life," Sanyal told PTI.
"When Ashish first narrated the idea, he told me that my character would be an insomniac somewhat similar to what Christian Bale did in 'The Machinist'.
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"I lost weight and started sleeping for only two hours a day. It took me almost a month to return to a normal routine after shooting the film. My character is very interesting, he is someone who is haunted by his own insecurities," Sanyal said.
"Ashish has assisted Anurag Kashyap on 'Dev D'. I knew him. We were at a friend's place and I was working on the theatrical production of 'Waiting for Godot'. He said he had a film in mind. He asked me whether I would do it and I said yes. He had nothing on paper at that time so when he started writing, he had me in his mind," the actor said.