Concerned!

 It sounds like night tremors. My oldest had issues with that and it lasted for about 4-6 weeks. His ped. told me to leave on a noise machine like the white noise or the sounds of the womb. Or something playing soft lullabyes. But to constantly have very low sounds in his room at night. Now this was a LONG time ago (he is 20 now) so I am not sure if there is anything different now, but it worked for us. Hope she is ok, that is one of those scary things you don't want to have to see I know! Give her pediatrician a call, or if you have insurance, most plans have a 24 hr nurse hotline for questions just like that. They may be able to help. Good Luck.

it's very very normal...my four year had them for a while...she woke up, crying so hard she literally puked all over the place it was that bad..............you just need to sit and comfort her, and tell her that you are there for her, and that it's going to be okay.