U+1F634 · emoji since 2015
The sleeping face with its little zzz means exactly what it shows: I'm exhausted, I'm off to bed, or this is putting me to sleep.
It's the standard goodnight sign off and the polite way to call something boring. Send it at 11pm and it's cozy, send it during a meeting recap and it's commentary.
In texting, 😴 does not carry a widely used hidden or slang meaning, so you can usually take it at face value. People send it just as it looks, to add a little visual touch or set the mood of a message. Only a handful of emoji have a separate texting code, and 😴 is not really one of them.
Its official Unicode name is the Sleeping Face emoji. In everyday chat most people just call it the sleeping face emoji or describe what it shows. Copy and paste it from the button at the top of this page.
The 😴 leads off a short phrase, and the rest of the words are written in cipher, every letter disguised as another emoji. Tap decipher to reveal the whole line.
Or make your own cipher in the translator.