What Causes Night Terror In Adults?

Hello. I m 40 year old female who is not overweight. My cholestrol, etc is great. For about the last 6 months I jump out of bed very confused or sit straight up in bed. I go to bed around 10 nightly and it s usually about 3 hours in. Is this a sleep disorder or possibly anxiety? My heart is racing when I wake up and I m shaking most of the time. Thanks for your help in advance.