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Wake up! It's International Pillow Fight Day!

Oli Scarff / Getty Images

Revelers take part in a giant pillow fight in Trafalgar Square on 'International Pillow Fight Day' on April 6, in London, England.

Mass public pillow fights were arranged in numerous cities around the world as part of the 'Urban Playground Movement,' which facilitates free, public non-commercial events.

Laszlo Beliczay / EPA

People participate in a pillow fight in Budapest, Hungary.

Eduardo Munoz / Reuters

New York

Alexander Klein / AFP - Getty Images

Vienna, Austria.

Ueslei Marcelino / Reuters

Brasilia, Brazil

Wang Yuqing / Zuma Press

Hong Kong