Ok so my 18 month old niece has had some sleep issues lately. It's been going on since she turned 1 where she hardly sleeps or wakes up all night long. They did a Epilepsy/sleep study and everything came out fine. But she is still not sleeping,therefore she is becoming violent. I told SIL about checking her melatonin level(someone here advice me on that) well the ped told my SIL that she didn't know what kind of test that was. I'm like Wtf.