A bed-in is a nonviolent protest against wars, initiated by Yoko Ono and her husband John Lennon during a two week period in Amsterdam and Montreal as an experimental test of new ways to promote peace.

The idea is derived from a "sit-in", in which a group of protesters remain seated in front of or within an establishment until they are evicted, arrested, or their requests are met.

Knowing their March 20, 1969, marriage would be a huge press event, Lennon and Ono decided to use the publicity to promote world peace.

They spent their honeymoon in the presidential suite (Room 702)[3] at the Amsterdam Hilton Hotel for a week between March 25 and 31, inviting the world's press into their hotel room every day between 9 a.m. and 9 p.m. Due to the couple's very public image, the Amsterdam bed-in was greeted by fans, and received a great deal of press coverage.

[10] Instead they intended to hold the event in the Bahamas at the Sheraton Oceanus Hotel, flying there on May 24, 1969, but after spending one night in the heat, they decided to move to Canada.

Lead singer Noel Gallagher sings "I'm gonna start a revolution from my bed / 'Cause you said the brains I had went to my head / step outside, summertime's in bloom".

The first two lines, per Revolution in the Head: The Beatles' Records and the Sixties (which Noel was reading), were said by Lennon during a taped conversation he had at his room at The Dakota.

[20] In the music video for the Marcy Playground 1999 song, "It's Saturday", the group finds their way to the bed of Lennon and Ono during their bed-in.

In late 2006, Billie Joe Armstrong, lead singer of Californian rock band Green Day and wife Adrienne did a similar bed-in with a poster above their heads saying "Make Love Not War" in Spanish.

On Lewis Black's Root of All Evil, comedian Andy Daly exhibits a video clip showing that he has also attempted a bed-in to protest the War in Iraq.