Written and directed by Makrand Deshpande, "Sona Spa", based on a Hindi play, focuses on lack of sleep due to various reasons that altogether cause unhealthy and tiring life.
Composed by Shamir Tandon, it is a promotional song for the movie.
"Shamir came to my house and he wanted me to sing the song in such a manner, like they used to sing during the 1940s and 1950s era. It really excited me and I am really happy to be part of the song," Asha said in a statement.
While recording, both the singers sang "Hum neend ka business karte hain" in a joyful tone.
"Since I like changing voice while singing, I was told to sing the song which had the feel of 1940s and 1950s - it was quite exciting," said Sudesh.
"It was a double delightful situation for me when I was told that I will be singing the duet with Ashaji," he added.
Produced by Miraj Entertainment, "Sona Spa" will release March 22.