Meanings of soporific qualities in English

Sleep is beneficial on account of its soporific qualities.

Creb nodded again; he was familiar with the soporific qualities of hops that induced a mild state of euphoria in a different use.

The plants, too, which formed the witches' pharmacopoeia, were generally selected either from their legendary associations or by reason of their poisonous and soporific qualities.

But if Lettuces are taken at supper with this view of promoting sleep, they should be had without any vinegar, which neutralises their soporific qualities.