Waking up screaming but no dream?

[TheTwoZees]

A few times over the last week I've found myself sitting bolt right up in bed, screaming out and heart pounding. No idea why though as I haven't had a bad dream.
Google said that if it's night terrors the person isn't usually fully awake so doesn't remember it happening at all.
I've been awake after each time for about 10 minutes or so and obviously can remember it's happened.
Whats going on?

Is it a silent scream? I’ve done it twice and it’s sleep paralysis. No dream beforehand but I start waking up, think I see something in the corner of the room but can’t move my body, I scream but no sound comes out, heart pounding and then after a few seconds I can move again.

Are you watching the news at the moment? Im surprised we’re not all doing this!

Nope, it's an audible scream. DH is getting fed up of being startled awake by it.