sop·o·rif·ic 
/ˌsɑ:pəˈrɪfɪk/ adjective
/ˌsɑ:pəˈrɪfɪk/ adjective [more soporific; most soporific] formal : causing a person to become tired and ready to fall asleep
▪ the soporific heat of summer ▪ a soporific drug
▪ the soporific heat of summer ▪ a soporific drug
— soporific noun, plural soporifics [count]
▪ a substance used as a soporific
▪ a substance used as a soporific
