I had some of this around the same time I was experiencing periodic vertigo. In my case, the inability to wake automatically was tied to nutritional / metabolic

I had some of this around the same time I was experiencing periodic vertigo. In my case, the inability to wake automatically was tied to nutritional / metabolic issues plus a general lack of sleep. My point being, at least in my case it was the body's warning signals. Once I got those issues under control, I've not experienced further issues with sleep paralysis.