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There is no better soporific and sedative than skepticism.-Friedrich Wilhelm Nietzsche
Because he had watched so many movies the night before, Joey was soporific the next day during school.
The professor had a soporific voice and I fell asleep. Here it is used as an adjective, meaning the soporific voice made me sleepy.
A decongestant and a soporific are combined in cold medicine used at night.
Ammonium is a radical, NH4, present in some kinds of ionic compounds; it does not have soporific properties.
The soporific effects of the medication helped me finally fall asleep after a restless night.