I used to go through a phase last year where I would get so many headaches, some lasting days and some lasting minutes. It seems to have stopped now but I ve noticed that every time I have a bad dream, I wake up with a headache, some worse than others. I ve told my family about my headaches, they think it is my sinus or allergy to gluten, or my eyes. I tested my eyes and they were perfectly fine. I went to a homeopath and they gave me something that has now helped except for getting the headaches after nightmares. I don t take the medication anymore, although now I do get a lot less headaches generally. (I also get a lot of nightmares this year recently)