Visage Bâillant

A yellow face with eyes closed and mouth wide open covered by a hand. Captured mid-yawn, this may represent having insufficient sleep, or to imply boredom with a person or topic.

Not to be confused with 😪 Sleepy Face or 😴 Sleeping Face, which often convey actually being asleep, or 😫 Tired Face which is tired as in "fed up".