I'm a little unsure of what delirium means, in these stroke cases. Does it refer to someone's repeating words or sentences many times while in a restless/agitated state of (apparent) sleep? And is this state really sleep, sleep with dreaming, or some kind of unconsciousness? These vocalizations are normally sentences, but don't relate to anything going on in the room, e.g., I built it because I enjoyed it and then, I enjoyed it because I built it.
Thanks for all the helpful comments.