Jasper yowls at night and in the early morning. He does not appear to be in pain and has dry food and water out all the time.

So, how loud are Oriental shorthair cats? There isn't necessarily one cat ... If he can't get outdoors, he'll yowl, scream, and make his frustrations known to everyone in earshot.

Cats may yowl at their humans for attention, or to tell other cats to stay out of their territory. During mating season, adult female cats yowl to let male cats know they are ready to mate.