If what happened to you in the past is causing nightmares, then you may have PTSD and you could benefit from counseling. EMDR is one type of therapy for PTSD.

You might have a sleep phase disorder. That's when your body wants to sleep at a different time than usual. With that issue, you would want to go to bed later and get up later than most people, and otherwise you would have a hard time sleeping. There is treatment for sleep phase issues. You might want to research this topic on the internet or research books about it. You could also talk to a doctor who specializes in sleep.

Is there any way you can remove some items from your busy schedule so you can have time to exercise or rest?