Jolting awake with an intense fear of death

Weird symptom that I get and I'm wondering if anybody else experiences this or has an explanation?

Sometimes when I'm falling asleep I wake up suddenly with an extremely intense fear of death and realization that I'm going to actually be dead someday. I've notice that this happens if I've had higher levels of generalized anxiety throughout the day but also if my brain is hyperactive before bed (even for benign reasons like daydreaming).

It's really weird, intense, and scary. I would say I have a general fear of death but it's not something I dwell on and if I actually think about it I feel more acceptance about the inevitability. However, these "attacks" are so intense and fill me with such a primal terror. It feels like an out of body experience almost. It's so weird but when I google it I just get articles about being afraid of death instead of addressing this super strange panic attack like episode that will occur without thinking about death beforehand.

Anybody relate?