Thoongaa Vanam (transl. Sleepless forest) is a 2015 Indian action thriller film directed by Rajesh M. Selva. The film stars an ensemble cast including Kamal Haasan, Prakash Raj, Trisha Krishnan, Kishore, Sampath Raj, Guru Somasundaram, Yugi Sethu, Aman Abdullah, Asha Sharath, Madhu Shalini and Jagan. It was filmed simultaneously in Tamil and Telugu languages, the latter titled Cheekati Rajyam (transl. Kingdom of darkness). Both versions were produced by Raaj Kamal Films International and Sree Gokulam Movies. The film is a remake of the French film Sleepless Night (2011).

Thoongaa Vanam was released on 10 November 2015 coinciding with Diwali while the Telugu version Cheekati Rajyam was released on 20 November 2015. The film received positive reviews from critics. This film marks Trisha's 50th film and completes her 15 years in the industry.