OMG, dude, that is a freaky nightmare, and about your fav show too, yikes. The writers do a pretty good job of keeping the show intense and scary with a lot of implied heebie-jeebieness, so I'm not surprised that it will cause nightmares.
Unrelated, but the other night I had a nightmare that I watched my brother fall into a chasm between to rocks, like he was trying to jump from one side to the other, mis-judged the distance, and I watched him plummet. It was very extremely disturbing, and I tried to forget about it.
Question: before you had the Lost nightmare did you eat a lot of fast-food or pizza? That seems to trigger nightmares for me.

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