"Turn Off the Light" is a song written by Canadian singer-songwriter Nelly Furtado for her debut studio album, Whoa, Nelly!. Produced by Gerald Eaton and Brian West, it was released as the album's second single in mid-2001 (see 2001 in music). Furtado, who cited a song by the Canadian band Big Sugar as the inspiration for "Turn Off the Light", has described it as "a real song ... Though I may seem so independent and stuff, blah, blah, blah, when I turn out the light at night I can get lonely just like everybody else. Maybe that's why it's such a good song and everyone is responding to it – because it's real. Just a song with a fun, hooky chorus."
There were two music videos made for "Turn Off the Light", the underground version, and the normal version. The normal version was directed by Sophie Muller. The music video for the normal version of "Turn Off the Light" begins in a swamp where Furtado is sitting on the edge of a log and people are swimming in the swamp. She begins to sing the first verse and when the chorus commences the people in the swamp pull her in and they start dancing in the swamp. The second verse starts and Furtado is seen at a temple singing while some dancers jump out and dance with Furtado. During the second part of the chorus, she is surrounded by a group at the temple and they dance around her while she sings. During the bridge she is shown at an old house singing and is sitting on a chair. The video ends with Furtado back at the temple eating noodles. The underground video features Furtado playing the guitar in a wooden shed, wearing a white top and jeans. She is also seen buying flowers. There are also scenes of Furtado walking in the grass wearing a white dress and sandals with an umbrella. Later in the video she loses the sandals and is seen walking in the grass barefoot. There is also a scene of her walking on rocks barefoot wearing a white dress.
The song eventually became her most successful song at the time of its release. In New Zealand, it became her first number-one single there and stayed in the chart for twenty-seven weeks. It became the second most successful song of 2001 year-end chart. The song is 28th most successful song in that country and the most successful song for Nelly Furtado in that country. It peaked at number five on the U.S. Billboard Hot 100. A remix featuring rappers Ms. Jade and Timbaland was released, and a dance remix reached number one on Billboard's Hot Dance Music/Club Play chart. The song ranked at number 70 in the Year-End chart of 2001 and at number 92 on the 2002 recap. It peaked at number 5 on the Billboard Hot 100 Airplay Chart. It peaked at number seven in Australia, being her second top ten single there and stayed in the chart for twenty-one weeks. It also peaked at number four in United Kingdom, becoming her second top five single there.