somniferous

Causing heavy eyelids

Somniferous means sleep-inducing.

The word describes anything that causes drowsiness or sleep: the somniferous effect of warm milk, a somniferous lecture.

It's a formal or literary alternative to sleepy or sedative, often used with mild irony to describe something tediously boring.

sleep-inducing

drowsy

Nearly falling asleep

doze · narcotic · opiate · sedative · anesthetic · hypnotic · restful · numbing · heavy-lidded · yawning

monotonous

droning

Sustained monotonous sound

  • tediousBoring through length
  • boringFailing to engage interest
  • dullLacking edge or interest

repetitive · humming · murmuring · hypnotic · mesmerizing · entrancing · rhythmic · monotone · stupefying · mind-numbing

calming

soothing

Reducing distress or discomfort

serene · gentle · relaxing · quieting · palliative · restful · placid · mellow · reposeful · unwinding

drowsy

sleepy

Wanting to doze

weary · tired · sluggish · languid · listless · heavy-eyed · torpid · enervated · groggy · bleary

Opposites
effect on wakefulness and alertness

somniferousstimulating

Arousing interest or energy

arousing · awakening · wakening · rousing · energizing

Family

insomnia, hypnosis, somnolent, insomniac, somnambulist

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Used worldwide · Timeless · Abstract · Rated G