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Illustration of a man dozing while sitting down

Illustration of a man dozing while sitting down

Illustration of a woman dozing while sitting

Illustration of a woman dozing while sitting

Illustration of a woman dozing off in class

Illustration of a woman dozing off in class

Illustration of a man dozing off in class

Illustration of a man dozing off in class

Illustration of male high school and junior high school boys sleeping in or studying

Illustration of male high school and junior high school boys sleeping in class or studying

Illustration of a female high school student or junior high school girl sleeping in or studying

Illustration of a female high school student or junior high school girl sleeping in class or studying

Illustration of a person (male) who uses a smartphone at work

Illustration of a person (male) who uses a smartphone at work

Illustration of a person (female) using a smartphone at work

Illustration of a person (female) using a smartphone at work

Illustration of male high school and junior high school boys using smartphones during class

Illustration of male high school and junior high school boys using smartphones during class

Illustration of a female high school student and junior high school girl using a smartphone during class

Illustration of a female high school student and junior high school girl using a smartphone during class

Illustration of male high school and junior high school boys using smartphones during class

Illustration of male high school and junior high school boys using smartphones during class

Illustration of a female high school student and junior high school girl using a smartphone during class

Illustration of a female high school student and junior high school girl using a smartphone during class

Illustration of a male high school student and a male junior high school student using a laptop computer

Illustration of a male high school student and a male junior high school student using a laptop computer

Illustration of a male high school student and a male junior high school student using a laptop computer

Illustration of a male high school student and a male junior high school student using a laptop computer

Illustration of a female high school student and junior high school girl using a laptop computer

Illustration of a female high school student and junior high school girl using a laptop computer

Illustration of a female high school student and junior high school girl using a laptop computer

Illustration of a female high school student and junior high school girl using a laptop computer

Illustration of a man reading a book or cartoon while at work

Illustration of a man reading a book or cartoon while at work

Illustration of a woman reading a book or cartoon while at work

Illustration of a woman reading a book or cartoon while at work

Illustration of a man operating a smartphone while at work

Illustration of a man operating a smartphone while at work

Illustration of a woman operating a smartphone while at work

Illustration of a woman operating a smartphone while at work

Illustration of a man yawning in class

Illustration of a man yawning in class

Illustration of a person (woman) yawning in class

Illustration of a person (woman) yawning in class