Shaking in my sleep...(whats wrong with me?)?

This doesnt happen often but a few times in my sleep i've felt myself shaking like im having a seizure but as soon as i wake up i stop shaking and it only last a few seconds and its not because of a nightmare. Should i tell my doctor about this im a little worried i dont think its seizures but my father had them when he was younger. could seizures be hereditary?