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Why is my cat suddenly leaping scared from a deep sleep and hissing?

Updated On September 23rd, 2025

Pet's info: Cat | Mixed Breed | Male | neutered | 2 years and 8 months old | 10 lbs

My cat (2.5 yo male) has started leaping out of a dead sleep. He will be sleeping soundly and suddenly jump up (and one time hissed) like he's gotten very scared. He's never done with before and he's now done it like 3-4 times in this week alone. I'm worried about him...its almost as if someone has fired a gunshot and he's reacting to the sound.

1 Answer

Most Helpful Answer

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Answered By Dr. Melanie, BVSc MS

Veterinarian

Published on November 23rd, 2016

There are a couple of things that could be happening with Leo. He could be exhibiting symptoms of feline hyperesthesia. This is a neurological problem that can surface suddenly. It could be that Leo was startled by a loud noise or a bad dream, and that caused him to wake up suddenly. It could also be due to seizure activity. I would take Leo into the vet for an exam after Thanksgiving. With a detailed history, a physical exam, routine blood tests, and a urinalysis, the vet may be able to diagnose what is causing this behavior in Leo.

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