I've suffered with migraines for almost 20 years, but I've recently began to wonder if when I wake up with a migraine that's on the other side of the migraine I fell asleep with, is it a new migraine or the same migraine? I don't suppose it really matters all that much. I was just curious. Went to sleep last night (finally!) in significant pain on the left side and woke up this morning with no pain on the left and less significant, but still very present, pain on the right side.