Hi Purple,
I know you posted this a while ago, but it is a very interesting question. Would you be willing to elaborate more on what you mean by 'flicking in and out' of a creative state? I do this as well, but it is not as voluntary as I wish it would be!
I found a neat study about the connection between disassociation and creativity, postulating the link through the lens of the sleep-wake cycle. I can't provide the URL until I have more posts, but it is titled "Imagining the impossible before breakfast: the relation between creativity, dissociation, and sleep," if you'd like to give it a read.
I could spend a long time contemplating all the threads that weave into this topic. For example, how divergent thinking, also strongly linked with creative states, might figure into disassociation; or how the concept of 'flow' mimics dissociative states.
In any case, it definitely seems related, and I'd love to hear more of your experience with it, if you are okay with sharing.