Has this ever happened to you?

I just laid in my bed to rest for a few minutes and must've fallen asleep, maybe fifteen minutes or so. Next thing I know, I jumped up, really rapidly, and sat up, then stood up fast. I felt for one moment I was dead. Like I wasn't there fully. After another minute my heart started racing. I was so nervous of what had just happened.

I've woken up before from a deep sleep, and not known where I was for a few seconds. But this was so alarming, to JUMP up out of sleep like that, as if I were dead standing there...I think my brain wasn't in full consciousness. Luckily within a minute or two I was fine, and my heart stopped racing. Has this ever happened to you?
The closest thing I could find online of what it could be is a possible Hypnic jerk, where being overtired makes your brain get confused which sleep stage it's in. It was quite scary standing up, thinking I was dead..😢