somniferous

Quaffing it down, and betaking himself to bed, under its somniferous influence, the Wye waterman is soon in the land of dreams.

I did not find the jolting of the cart at all disagreeable; on the contrary, it had quite a somniferous effect upon me.

This yelp, sounding above the somniferous monotone of grumbling, stirred Cap'n Sproul from his dozing.

Two o'clock has just struck, and no somniferous result has followed.