When you are focused on a problem your left side of the brain take over (thinking in worlds and steps) When you relax, draw, daydream or sleep your left brain c

When you are focused on a problem your left side of the brain take over (thinking in worlds and steps) When you relax, draw, daydream or sleep your left brain can take over and think in parallel, images, abstractions. When you dream the constraint on your consciousness (simulation) are lifted to allow more divergent scenario. That’s why dreams can be a bit crazy. It’s a bit like brainstorming on steroid, letting loose of more constraints.