← BackshareGuesshypnagogue/ˈhɪpnəˌɡɑɡ/nounSomething that induces sleep or drowsiness.Warm milk is often considered a natural hypnagogue.The soft rain outside was a gentle hypnagogue that helped her fall asleep.Some people find the sound of a fan to be a reliable hypnagogue.SynonymssoporificsedativeAntonymsstimulant