Soporific (adjective)

1. Inducing drowsiness or sleep; having a sedative effect.
2. Boring or uninteresting to the point of causing drowsiness or boredom.
3. Tending to calm the emotions or soothe the senses.

Origin:

The word 'soporific' comes from the latin word 'sopor' meaning 'sleep'.

Examples:

1. The sound of the rain was soporific, making her feel drowsy and relaxed.
2. The lecture was so soporific that half the audience was asleep by the end of it.
3. The gentle rocking of the boat had a soporific effect on the children, putting them to sleep.
4. The soporific music was calming and soothing, helping her to forget about her worries.
5. The soporific scent of lavender filled the room, helping her to fall asleep quickly.