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I might suggest the idea of fugue states. While more commonly caused by drug or alcohol abuse, they can also be caused by epileptic seizures. My father experienced Grand mal seizures and if he had...
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I might suggest the idea of [fugue states](http://www.webmd.com/mental-health/dissociative-fugue). While more commonly caused by drug or alcohol abuse, they can also be caused by [epileptic seizures](http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3841600/). My father experienced Grand mal seizures and if he had a seizure while no one else was around, was sometimes found later with no memory of the seizure or the time before or after it. Later in life, when he was on a number of heavy medications to address them, he specifically began doing (or attempting to) dangerous things directly after a seizure (like standing in front of an oncoming train believing that he was impervious). He had no conscious memories of any of his activities or even his seizure.