somnogen

somnogen

(som′nŏ-gen″) [ somni- + -gen]
Any agent that induces sleep.
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"The classic somnogen adenosine is a strong candidate for evoking the sleep effect in the nucleus accumbens," Yo Oishi from the University of Tsukuba, co-lead author of the study, said in (https://www.eurekalert.org/pub_releases/2017-09/uot-wdw092717.php) a statement Friday.
The researchers noted that alcohol is considered to be a powerful somnogen, or sleep inducer, and approximately 20 percent of the U.S.