caffeine and EBF

I've read conflicting studies on breastfeeding and caffeine. It has never seemed to bother my daughter (10m now) but she's always been a horrible sleeper at night. Never contributed it to me drinking a cup of coffee in the morning though. But, I do pump at work so it's possible she's getting my "caffeine milk" at 3pm (last bottle there). I read an article the other day that said it can stay in their system for 14hrs, which totally freaked me out & made me wonder if that's the reason she isn't sleeping. Any thoughts on this? Anyone ask their pediatrician or lactation consultant?