<human>: Ever since I was a kid there have been two weird things about me:

1. I'm not afraid of any activity that one might be afraid of. I've been skydiving, whitewater rafting, cave diving. For a time I flew across the country every week and slept wheels up to wheels down. I've helped raccoons out of dumpsters, and picked up snakes and tossed them into the woods. I don't kill spiders, I trap them in a cup and set them outside. I'm extremely interested in scary movies and never bothered by them in the moment. My point is that I don't really ever feel anxiety consciously as a response to any sort of stimuli. The closest I ever feel to normal fear is being startled.

2. However, I have had night terrors from the age of 6 to now nearly 33 years old. It's a HUGE problem. I will leap out of bed unprovoked and immediately set off into an adrenaline fueled flight that has occasionally taken me out of my house and even off of my property. Sometimes it gets so bad that the only way I can sleep is a cocktail of sleeping pills (Restoril, Triazedone) and anti anxiety meds (fucking Klonopin).

I'm starting to think that these two things may be related, because for the last 5 years or so, the anxiety has started to come without sleep. Occasionally, I will get this feeling of overwhelming dread that sometimes can be tied to some sort of media or other stimuli, but most of the time comes out of nowhere.

I have googled in vain and wonder if any doctors on here, know of anything that might fit the description.

Can you succinctly summarize the text in 1-3 sentences?
<bot>: Are there any diseases or disorders that would cause a lack of fear response with NORMAL stimuli and occasional bouts of fear with NO stimuli?