Does it mean that you can't write, or that you're a bit batty maybe? No, it probably means you had a great idea that happened when you were tired, or when your mind was trying to write one thought while contemplating another.
Is that normal? Yes, unfortunately it is. When we try to multi-task too often we end up adding that, "one more thing," to our daily plate and end up with a total mess. The productivity we so wish for often ends up with very little that is good copy (As with we who write know).
I am of a mind to suggest that those of us who believe we are multi-tasking are actually simply adding too much to our lives and as a result aren't doing very well at anything. We can juggle - the brain can do that, but by focusing on the many - we lose the depth that we need to do any task well, and in the end have nothing by mediocracy, and that is scary.
