Halucinations

I started taking Zanaflex back in December to help prevent/control my migraine attacks.  It seems that for the most part, it is working pretty well (provided that I remember to take it during the day when I'm stuck in meetings, etc.).  After talking to my Dr. and increasing the dosage, I started getting halucinations at night.  At first, the images were scary but now, they're mostly just graphics or benign images (maps, ivy, puppies....things like that).  I spoke to my Dr. about it today and he said that this is very common.  That was it!  My husband is a little scared of me now - that they might get worse or dangerous.  Has anyone had this experience before????