|informal (functioning as singular or plural) a short light sleep; nap|
A nap; a short sleep: “If you're feeling drowsy, take forty winks; I'll wake you when our guests arrive.”
forty winks definition
A brief nap, as in There's just time for forty winks before we have to leave. This expression supposedly was first recorded in 1828 and relies on wink in the sense of "sleep," a usage dating from the 14th century.