In the Ramayana, Urmila was Lakshmana's wife and Sita's younger sister. When Lakshmana accompanied Rama and Sita to exile for 14 years, Urmila chose to sleep for the entire duration to compensate. The other options are wrong: Shrutakeerthi is associated with Bharata, Kaikeyi was Dasharatha's wife (Lakshmana's mother), and Tataka was a demoness killed by Rama.