I was thinking migraine, or some sort of physical pressure, as I was reading this, though the lack of any linguering pain is curious. I've had similar episodes, but without the wack on the side of the head. I tended to blame them on sleeping with my head in a position that put pressure on a specific nerve, and that nerve let me know its displeasure (or relief, I suppose) by releasing a flash of energy when I moved upon waking.
Seems a bit extreme for hypnopompic imagery, I think, but I wouldn't rule it out.
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