Webster's English Dictionary

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soporific

1. so.po.rif.ic \-'rif-ik\ aj [prob. fr. F soporifique, fr. L sopor deep 
   sleep; akin to L somn]us sleep - more at SOMNOLENT 1a: causing or tending 
   to cause sleep  1b: tending to dull awareness or alertness  2: of, relating 
   to, or characterized by sleepiness or lethargy 
2. soporific n : a soporific agent; specif : HYPNOTIC