The human mind is an incredible thing, when you pan your eyes around a room you don’t actually “see” a lot of what you see, your mind fills in the blanks with what it expects to be there. I’ve often had experiences where I’m lying in bed and feel as if I’m awake but I just know that my eyes are closed even though I can see everything in my room. Weird.
But yeah, sleep paralysis: Am i right in saying that the first time you experienced it was when you were waking up and the second time was when you were going to sleep? If so then these are technically two different states. When you are falling asleep you go into a hypnagogic state, hence hypnagogic imagery, this tends to be fairly relaxed (in my experience) as you are eased into it relatively gently.
However, when waking up sith SP you’re in a hypnopompic state, your mind has woken up whilst your body remains asleep, this tends to be a lot more disorientating and even frightening as you’re mind, though awake, is still shrouded in the remnants of dreams. This is the state in which most visits from the Old Hag (or you’re own personal variation on the theme, mine being a freaky deaky guy with no face, who i like to call Mr Not-Real-No-Face) occur.
As for the strong, vivid imagery, this is typical of HI (for me, not the egyptian theme but the, i don’t know, realness (that’s not a word!) of what I’m seeing. When the imagery is as strong as this it tends to mean, to me at least, that I am literally on the cusp of entering the dream state proper.
Sorry about the essay there 
EDIT: as for raising out of your body, that sounds like an OBE. I don’t know much about that but I’m sure that there are some experts somewhere on here who can tell you what to do in that sort of a situation. (maybe the Radio was an Astral Radio, you mentioned that it was old fashioned, that’d be pretty cool if it had left an imprint on the astral plane! BTW, do you remember what the radio was playing?
ANOTHER EDIT: Since you’re new here you may want to pop in here: [the BIG "Hi, I'm new here!" topic part 52) to say Hi to everyone