hypnagogic vs soporiferous

hypnagogic and soporiferous both are adjectives.

Word	Noun	Adjective	Verb	Adverb
hypnagogic	No	Yes	No	No
soporiferous	No	Yes	No	No

As adjectives, hypnagogic and soporiferous are synonyms defined as:

Other synonyms of hypnagogic include hypnogogic, somniferous, somnific, soporific.

hypnagogic (adjective)	soporiferous (adjective)
sleep inducing	sleep inducing
	inducing mental lethargy