Help! what happen to me please help!?

i was sleeping having a weird dream then suddenly i blacked out. i did not wake up but i felt myself black out. then suddenly i heard my mom voive calling my name constantly. i kept saying 'what!' and each time i said it she say me nmae once again. i was getting real fustrated and i started to yell WHAT!' but she would keep saying it. then finally she yelled my name loudly one last time i woke up startled and shaking. i felt hypnotize. as i woke up i felt myself scream. and my stepdad in the next room heard me. it was so weird. why did this happen.