panic attacks waking me up

Anxiety and panic attacks are not anything new for me. Ive been dealing with anxiety probably all my life and Ive had panic attacks since about the age of 10. Im in my 20s now. Ive actually started to feel like Ive gotten a really good hold on it except for lately Ive been having a hard time sleeping because when I sleep, I get these overwhelming feelings about death. Mainly about my own death, what it will feel like, the feeling that its going to happen soon, and it causes me to go into a panic attack. It starts when Im like half awake, I can realize where I am but its like I cant control my own thoughts. Ive had problems with thoughts of death in the past and Ive learned how to manage them. But I cant manage them if its happening when my brain is half shut off. And I dont have any anxiety before this starts. Has anyone else experienced this? Any ideas on how to make it stop?