The clip comes from a user-generated soundboard rather than a film, television show or named character, and its file details point to a Dutch voice changer tool, which explains its altered tone. The phrase itself is everyday Dutch for sleeping well tonight, and that ordinariness is part of the joke when it is delivered in an exaggerated artificial voice. Shared as a short meme sound, it circulates mainly as a night-time sign-off, often paired with a snore sound in edits that end with a character falling asleep.