Why do I always have bad dreams?

Here lately it seems as though every single night, sometimes multiple times a night, I'm having nightmares. I'm not sure what causes them. I've heard it can be poor diet or staying up too late watching scary movies. I'm not doing any of those things! I eat clean, I haven't watched a scary movie in months, and I get plenty of sleep. I've looked into dream meanings and haven't really gotten anywhere with that either. I've prayed and that works temporarily but the dreams always creep back in. I'm actually on the search now for a dream catcher. I've been reading about them and I'm wanting to find one that's legitimately Native American made. It's supposed to be made from grape vine or soaked willow, have 3-4 feathers, and be within a certain diameter (I'm still researching!). All the ones I can find are frilly colored and have like 10 feathers so I'm still on the hunt. I'll report back and post a link as soon as I find a trustworthy distributor or creator. Maybe a dream catcher is just mind over matter, but I'm going to have faith in it and hope for the best! I do have a bit of Cherokee blood in me, after all. (: