After dinner, Charles sank onto the couch by the fireplace and—succumbing to the soporific effect of his full belly and comfortable surroundings—quickly fell asleep.—— Merriam-Webster

The effect is bizarre: 11 moving images of Mr. Starck's bearded face, each talking — sometimes even singing — simultaneously. With music created by Laurie Anderson rumbling in the background, the cumulative noise resembles that of a loud cocktail party and, after an hour or so, can become soporific. Yet visitors standing or sitting near each talking head (chairs are provided) can in fact make out what is being said. —— Alan Riding; Philippe Starck as Talking Heads; The New York Times; March 20, 2003

The perfect place to plot a murder or a novel then? You're more likely to plot it than execute it, so soporific is the mix of marble flagstones, intricate carpets, mashrabia wooden screens, hot desert days and nights, good food and drink. Its cleanliness would have delighted the hypochondriac Poirot. —— Tom Templeton; Old Cataract Hotel, Aswan, Egypt; Guardian; Sept 15, 2002

What's it like? Opened at the end of 1998, and somewhat formal and hyperactive by the Seychelles' soporific standards, the Lemuria is the closest thing to the luxury resort hotels of the Caribbean or Mauritius. —— Jill Cranshaw; Barefoot Luxury; Guardian; Dec 15, 2002

Did you know? (Merriam-Webster)

In Greek, he was called "Hypnos," but in Latin his name was "Somnus," and he was the god of sleep, the son of Night, and the brother of Death. "Somnus" is also the Latin word for "sleep" and is related to the noun "sopor," another Latin term meaning "deep sleep." It is "sopor" that we find at the root of "soporific," an adjective that has been appearing in sleepy contexts in English since the mid-1600s.