First of all, zzzz (or z-z-z-z) is sound of snoring, from at least 1918. (Sometimes "a tiny saw cutting through a log" [1948] would be used, and both the snore and saw would make the same z-z-z-z sound.) Over time, this became associated with sleep in general, but most comic reference books (e.g. 2006's KA-BOOM!
(2) zzzz (4 letters) (3) zzz (3 letters) My question stems from when I first wrote it as "zzzzz" (5 letters) in an English text, but a friend told me it should have been written as "zzzz" (4 letters) so I decided to ask here. More confusion arises from the following source because Susan Ince, the journalist, uses "zzz" (3 letters):
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