IPA: //sɒm.nɪˈfæ.ʃənt//
KK: /sɑmˈnɪfəˌʃənt/
Having the ability to induce sleep or cause drowsiness.
The doctor prescribed a somnifacient to help the patient sleep better at night.
Somnifacient → It is formed from "somnus" (meaning sleep) and "facere" (meaning to make or do). The word describes something that makes one sleep or induces sleep.
Think of 'sleep' ('somnus') and 'making' ('facere') to remember that somnifacient refers to something that induces sleep.