Have you ever been afraid of falling asleep?

So this weird thing happens to me sometimes. I’ll be nodding off into dream land and all of a sudden this fear of going to sleep wakes me the heck up. Then, even though I’m drowsy and tired I keep my eyes open to stop from dosing off. All of a sudden sleep starts feeling like pseudo-death. I get these thoughts in my head which terrify me of closing my eyes and just disappearing from “being awake” for a while. Unfortunately I can’t explain it any better but feel free to ask questions.

I don’t feel like this all the time.. just on some rare occasions. Does anyone else feel like that? Could this be anxiety related?