You have two different sides to the brain and four different modes of thought patterns to deal with.

The alpha pattern is normal thought for every day stuff.
Beta mode is for when you are under stress.

Delta for maybe sleep I forgeta and another for meditation type stuff.

I think when you are relaxed and not in any particualr mode ,all of a sudden one can slip in and place these weird thoughts in action without you realizing (Alpha wise ..the analitical ,normal mode). So the thought ends up going deep into the subconcise level because you havent bought it to the Alpha mode fully .

Thats why you have the uncontrollable urge to experience it .
As that will bring it to the Alpha mode for you physically so you can then analize the experience.

People who suffer from post tramatic stress disorder go around in beta mode and suffe all types of delusions that they thionk are real!
The walking nightmares of ex fighters and people who have suffered trauma of other types or survival situatiions can be dealt with by useing brain gym exersizes ,or visiting a top kinesiologist who can reprogramme the mind set are best.

Or hypnotherapy if your that way inclinded,but the cures arent always 100 per cent there.
Western medicine doesnt work so good here as they just fill you with drugs that work on the surface but make you feel dependant so the thought gets to go in circles if the drug diminishes.

Hope this helps.