staying up late

I suffered with migraines for years, then they eased off. Now all of a sudden it seems I get one every Sunday morning. The only thing I do different is stay up late on Saturday night. I get up about 5:30 every morning for work, and sometimes am up late on Friday. It's the only thing I can come up with. Sometimes they are mild, and Excedrin can take care of them and sometimes they don't go away till afternoon. Anyone else experiencing this? I am an older woman, 55, so maybe it comes with age. I don't know, but it stinks!