Its first use can be traced back to 1903 in the comic Katzenjammer Kids ... may vary, Zzz has made its mark; it’s recognized internationally as a symbol for sleep. Have you got a Big Question ...

Whether you’re learning a new marketing strategy, pitching investors or trying to remember the details of your kid’s soccer schedule, sleep solidifies those memories and sharpens cognition.

One representation ultimately stuck, though: the letters Zzz. Its first use can be traced back to 1903 in the comic Katzenjammer Kids, created by Rudolph Dirks. In it, the snoring Captain sleeps ...