Dreaming happens during REM level, which is light. You don't dream during deep sleep. http://www.sleepdex.org/stages.htm so if you are dreaming a lot, you spend more time in REM.

Yes!! I finaly went to a neurologist who gives me Botox. I was having 20 a month andits cut them in half!

I also have angina attacks, I also dream from the time I go to sleep until I wake sometimes very vivid dreams leaves me ill all over

I have been dreaming a lot lately. Weird dreams that really don't make any sense but I don't get headaches much.

I dream a lot. Almost daily and usually recall my dreams no problem. Some of my dreams actually caused me to have an Angina attack so I can imagine it can start a migraine.
I think if our bodies are stressed and not sleeping soundly or deeply enough for restorative sleep then it will react to any stress during the night. Hope this helps. Just my opinion. Gentle hugs and God bless.