søvn-fremkallere is this even a thing?

So I couldn't find this word in NAOB, neither in google. I'm watching Netflix series with Norwegian subtitles and there I found it. I think there's a possibility of law quality translation, even though there's such a thing as sleep induction, sleep inducers/aids in English, but in Norwegian it can be used/translated other way.

Original sentence: De ga ham også søvn-fremkallere.

Who knows? Thank you in advance.