The line is associated with Stewie Griffin, the baby character voiced by Seth MacFarlane in the animated sitcom Family Guy, which first aired in 1999. Short clips of Stewie crying or speaking in an exaggeratedly adult, emotional way have circulated online for years as reaction audio. This sleep line spread on soundboards and in short videos because it sums up late-night exhaustion in a recognisable voice, and creators reuse it for study, work and gaming contexts where someone has clearly stayed up far too long.