10 year old began vibrating in the middle of the night. she didnt have huge movements or even wake up. it was as though she was trembling. is this worrisome or just a normal part of sleep? thanks?

The issue here is whether this was a sleep seizure or harmless sleep myoclonus or muscle motions such as can occur during dreaming. Absence of body stiffening,urinary incontinence or tongue biting favor a benign situation. Should trembling episodes occur again during sleep or when awake, a neurological consultation should be obtained. The pediatrician can refer you.