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Arjun is a newsreader who lives in Chennai with his single mother, his short-tempered brother, Saravana, sister in law, Kalpana and nephew. He suffers from light sleep, which means the quietest of sounds will awaken him. In Coonoor, Deepika Alias Deepu is seeking for an alliance, which fails because she addresses her snoring problem. As Arjuns Mother Lakshmi and Deepika's Mother, Vasanthi were old schoolmates, Arjun and Deepika both get along well and eventually get married. On the first night, Arjun confesses about his light sleepiness, which makes Deepika paranoid. She decides to stay awake on her mothers advice but falls asleep and ends up waking up Arjun. He becomes paranoid, so much so that his honeymoon ends early when he breaks his nose in an accident. Eventually on his friends advice, he decides to address the problem with an understanding and initially things seem fine. But when ENT specialists says its untreatable, he starts arguing with Deepika. He then comes up with an idea of alternating sleep, so whoever's not sleeping has to be awake. Everything goes fine and eventually Arjun gets a job as newsreader at his dream company. But things go south when he doesn't sleep on the day there is a last minute interview with the finance minister, he prepares for it but ends up sleeping in the bathroom, missing the show, being humiliated by his colleagues and fired. Angry, Arjun decides to apply for divorce, much to Deepika's dismay. Everyone else disagrees and tries to pull him out of it, but he wont budge, resulting in him arguing with his brother and mother and leaving the house, living with his friend, Panda. Deepika reveals shes pregnant, however adamant with his decision, Arjun decides to raise the baby separately. Deepika is upset and decides to abort the baby, despite Arjun trying to talk her out of it.