Anyone have any ideas how I would invoke a nightmare?

I used to have a particularly nasty one that repeatedly recurred when I were a young lad... I used to find myself crying in my parents arms, having screamed in my sleep.

I would like to invoke it and figure it out, perhaps with Lucid Dreaming.

Problem is, I remember very little of it, other than a unnerving feeling that I get now and then.

Ta.