Her hectic days of shooting "Room" finally pay off. Brie Larsen, who received her first Oscar for Best Actress in the 88th annual Academy Awards 2016, thanked her co-worker, 8-year-old, Jacob Tremblay and all the crew she's worked with. She also made a sweet shoutout to her real partner, Alex Greenwald.

Her portrayal as a woman in isolation was an exhausting role to play. "I was on this restrictive diet with the help of a nutritionist," she told CBS News. Larson had to work with a trainer and consult with trauma counselor every day to get that exact mood and aspects of a woman being confined in a small room for 7 years. She did a research on how living in silent and dim space, 10-foot by 10-foot, for so long could have affected a person's behavior.

The scenes, which she recalled as emotional marathon had drained her literally. Discussing with her nutritionist, she tried to achieve the body mass of a woman who stayed out of the natural light for months. Vitamin deficiencies and getting skinny - she made herself lose weight up to 12% of body fat with the help of a trainer.

Larson even had to warn her family that she could be very sensitive during the filming process. "When  you're playing this person 12 hours a day, your waking life is this character," she explains to Variety how the character could wire up to her brain at some point.

Room is a drama film adapted from a novel, of a woman and her son who live in a small space as captives. The story of an incredible love between mother and child is told through the 5-year-old boy perspective but focuses on his mother.