What is it?
Here is the description for the video above:
Thank you for sharing this interesting experience that she had.
My first thought as I was listening to this was that it was sleep paralysis, but she mentioned: that she was able to move, that she had past experiences with sleep paralysis, and she said that it was not that so that probably rules that out.
I doubt that it was a false awakening dream based on what was described.
My second thought was that it was a hypnopompic hallucination until she said that later her son heard the voice too, so that rules that out (unless he also had a hypnopompic hallucination of the same thing, which is possible since she described her experience to him, which increases your chances of experiencing things (including lucid dreams, sleep paralysis, et cetera) like this).
Now there is a chance that something strange & natural and / or paranormal and / or supernatural happened, if they can rule out hypnopompic hallucinations, & anything else that I missed.