soporiferous

/ˌsoʊpəˈrɪfərəs/
adjective
  1. Causing or inducing sleep; soporific.
    • The soporiferous drone of the airplane engine helped her fall asleep quickly.
    • The professor's soporiferous lecture made half the class nod off.
    • Chamomile tea is known for its soporiferous effects before bedtime.
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