What does ZZZ stand for?

MLA style: "ZZZ." Acronym Finder . 2012. AcronymFinder.com 2 Jun. 2012 http://www.acronymfinder.com/Sleeping%2c-Bored%2c-Tired-(ZZZ).html
Chicago style: Acronym Finder . S.v. "ZZZ." Retrieved June 2 2012 from http://www.acronymfinder.com/Sleeping%2c-Bored%2c-Tired-(ZZZ).html
APA style: ZZZ. (n.d.) Acronym Finder. (2012). Retrieved June 2 2012 from http://www.acronymfinder.com/Sleeping%2c-Bored%2c-Tired-(ZZZ).html

Sleeping, Bored, Tired

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Zhengzhou University (China) Ziv-Zakai Upper Bound Zanesville, Ohio (airport code) Zavod za Zdravstveno Varstvo (Slovenian: Department of Health) Zero-Zero Visibility Zwarte Zaken Vrouwen Nederland (Dutch: Dutch Black Businesswomen) Zero-Zero Weather Zydowski Zwiazek Wojskowy (Jewish Military Union; Warsaw Ghetto)		Buzzing Increasing Degrees of Contraction Zavod za Zdravstvena (Slovenian: Institute for Health) Zealous Zany Zombies (gaming clan) Zahnmedizinisches Zentrum Zürich Nord (German) Zakon o Zaposlovanju in Zavarovanju za Primer Brezposelnosti (Slovenia) Zavod za Zdravstveno Zavarovanje Slovenije (Health Insurance Institute of Slovenia) Zavod Za Zdravstveno Zavarovane Slovenije (Slovenian Council for Health Insurance)