Answer: Yes, they can be hereditary., but anyone can have one.Some families have a tendency to sleep deep. During this phase you can travel astrally. If you wake during this travel period you can have a panic attack or night terror. You will feel unconnected to your body and may be having an out of body experience.Now, the good news is we all have out of body experiences when we sleep. It is normal but many people do not remember the experience. Our souls unconnect from out physical bodies for short periods of time. We travel to other times and places and to heaven to visit relatives, friends, and our pets. It is a good thing.The bad part if the terror from waking up before your soul enters your body.More information can be found in Sylvia Brownes book of"DREAMs" She explains it in detail as do other Mediums.Take a look. You can find it a Amazon or Ebay or Half.com.