Well, Mummy, I hypnogogic imagery isn't caused merely by the light. As for pressure on the eyes, I'm assuming (with my best guess) that by doing that one is also cutting off oxygen to the eyes, thus creating the visual sensation of going blind that may be associated with blacking out.
However, when you fall asleep, there's usually no more pressure on the eyes as there is when one is awake. Rather, it's like a dream that is just beginning. Light doesn't affect the surroundings of a dream (typically), but rather the mind is creating or regurgatating images from our waking lives. Since one is just falling asleep, these images are few and random, eventually growing into a whole, relatively cohesive dream scene.
Then again, I may be wrong... but who knows.
-Amé
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