Most of you might think I am nuts for asking how to cause a nightmare, but there is a good reason for it. For as long as I remember, the 20 seconds before a nightmare starts, I am lucid. Now I haven't had a nightmare (that I remember) for ages, but if there is a way to cause a nightmare, please let me know so I can continue to my second step.

2 Step:
For the 20 seconds before a nightmare, I am traveling down a long, carpeted on the walls, floor and ceiling, hallway. Starting from the bottom right, I start to fly towards the top left until I am at the end, and then the nightmare starts, and I lose my lucidity. The question is, is there a way that I can control this, as to not reach the point of getting to the nightmare?

Any help would be grand!