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Definition of Hypnagogue
1. Noun. An agent that induces drowsiness or sleep. 
Medical Definition of Hypnagogue
1. An agent that induces sleep. Origin: hypno-+ G. Agogos, leading (05 Mar 2000)
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1. Noun. An agent that induces drowsiness or sleep. 
1. An agent that induces sleep. Origin: hypno-+ G. Agogos, leading (05 Mar 2000)