Characterizing Sleep

By posted at 3:00 pm on August 2, 2012 0

On this date 109 years ago, a cartoonist first paired the letter “Z” to the act of sleeping, beating out other attempts to write out the sound of slumber such as the tenacious “g-r-r-k-k-k-k” and the elegant “z-z-z-c-r-r-k-k-k-k.”

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