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I don't know why but the minute I get horizontal my imagination wakes up.

Yes! Considering that the same thing happens when I take a shower (sometimes) and when I meditate (usually), and that both of these are vertical in nature (usually), I think it's primarily to do with letting your brain 'rest'. Mindfulness and all that jazz.

I don't know what your life is like, but for me that's definitely the most likely explanation. When I'm not showering, meditating, or horizontal in bed, it usually means I'm reading something, watching something, working on something, or engaging actively in an internal monologue (that usually is more about reducing variables and maintaining control or the illusion of it, and less about creativity).

The moment my brain gets some free time, and there's nothing acute to worry about, ideas start to appear and I get excited.

Not a biologist or neurologist, but my hypothesis for this is ease of blood flow to the brain while horizontal.

Nah, it's not that simple. It cannot be that simple (but that's just my intuition of course). I do have a different mindset when my blood flow it strong after sport but it doesn't kick the creativity. On the other hand, travelling, or even taking the train, does trigger the wonder-sense.

> It cannot be that simple @agumonkey

Occam's Razor: The (simplest) explanation with the fewest assumptions tends to be the correct one.

It's almost always that simple.

Also, when you're travelling or on the train, and your wonder sense opens, you are relaxed. Less constriction to the arteries and blood vessels. As with lying horizontal, increased blood flow activates the brain.

There's simple and simple. In biology the number of dimensions is large, which one is simplified ? blood flow ? visual stimulus ? change of locus (again more stimulus since memories cannot help parsing reality).

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