When I was a kid I used to have two recurring nightmares. There was the falling one and the chewing tobacco one. I don’t know over what period they lasted but they eventually came to an end. They were both extremely unpleasant nightmares.
Last night I had a nightmare in which I became extremely distressed (in the nightmare) and which I brought to an end in order to end my distress. Even so, I was still very shaken despite being awake. Fortunately I don’t get many dreams or nightmares like that.
I seem to be able to bring a dream to an end simply by recognising it’s a dream and deciding to end it. Well that’s what I think is happening. I don’t know whether that’s the same for everyone.