Weird sensation when trying to sleep?

Erin

This has happened to me a few times, but it’s not super common (twice in the past month maybe?). Basically, when I’m dozing off into sleep, I get this sensation where I just like, disappear. I can’t feel anything, my brain feels blank, I don’t feel alive, and I’m not thinking. It just happened to me and I’m pretty sure when it happened, i was groaning the whole time. It lasts about a few seconds, i believe. Any thoughts?