Significados de so soporific en inglés

Rarely has something so revolting (I mean that bit as a guarded compliment) proved so soporific.

While the tranquillity heightens your awareness of the surrounding traffic, the smoothness is, at times, so soporific I almost dozed off.

THE little rabbits smiled sweetly in their sleep under the shower of grass; they did not awake because the lettuces had been so soporific.

"And are they so soporific?"