Okay I've been having these really crazy dreams and i just want some type of explanation or thought about it?

So i have post traumatic stress disorder so its not unusual for me to have nightmares, but for the past couple years ive been having these dreams that arent related to the event that gave me ptsd at all. It always starts out where im in my bed but im asleep and for whatever reason im scared and i try to get myself to wake up, and ill scream wake up wake up! and eventually ill think im awake and ill get out of my bed but then ill look at my bed and im still there asleep. i can see my room and it looks the exact same way it does in my sleep. sometimes there will even be a ghostly looking figure in the room with me. when i see it i always run into my moms room which also looks exactly the same as it did the day before and i will try to wake her up but she doesnt wake up and the figure will sometimes follow me into her bedroom. then i run back into my bedroom and try to wake up my body thats lying in my bed and ill eventually wake up for real. when i look at the clock it always says the EXACT time that it said in the dream. ive talked to my mom about it and she said its called astro traveling and many of the people on her moms side of the family can do it and shes done it before but i dont know if i believe it and it really scares me. is this ptsd or is astro travel real or it just a crazy dream? i really want some input im actually scared to go to sleep at night. please help