Messed up sleep patterns?

I just recently (three weeks ago) got on my birth control and I've been having a god awful time sleeping. When I do sleep it's restless and I wake up every hour or so. It started happening a week after I started my pill but I also have been away from home for a few days and exams are coming up. My mom says it shouldn't be the pill because she took it before and didn't have trouble sleeping. But..we are two different humans and medicines change and advance.. I was wondering if any of you ladies have had problems sleeping since being on birthcontrol?