Can melatonin cause you to test positive for barbituates?

I am wondering this myself. I take Melotonin along with Ambien and get drug tested every once in awhile by my doctor because I take Suboxone. I always test positive for Barbituates and my doctor figured it was because of the seizure medication I was taking (dialantin) she trusts me and doesn't give it a second thought(which she should). Seizure meds can cause positives for Barbs but they are mostly in drugs like Phenobarbitol. So it points to the Melotonin.