When I was young - into my teenage years - I often experienced hallucinations very similar to some visions I have experienced in hyperspace.

In one state I experienced many times I would feel pinned down in bed and bombarded by hundreds of images a minute, shown in squares dropping down at me at very high speeds. Although these images did not have that other-dimensional style to them the feeling and speed of the experience were very similar indeed.

As a non-spiritual person my feeling is that children's minds are rather more open than ours and are therefore able to experience the mind and it's processing in a more raw state. As adults our minds have been trained to block out extra information so we have to open them manually with music, chemicals, dance, mediation and other things most of the time. I still occasionally experience psychedelic states when straight, but rarely hallucination and then never those of the all-enveloping type I did as a child.