MY SIX YEAR OLD HAS EXPERIENCED 2 EPISODES OF SEISURES

MY SIX YEAR OLD HAS EXPERIENCED 2 EPISODES OF SEISURES , THIS HAS HAPPEN DURING THE FIRST HALF HOUR WHEN HE FALLS ASLEEP, HIS LEFT SIDE OF HIS FACE SHAKES AND HE DRULES AND IS VERY SLOW TO RESPONSE TO US. ALSO HIS HEART RATE INCREASES. HE HAD A CT SCAN AND IT CAME BACK NORMAL WE ARE CURRENTLY WAITING ON HIS EEG TEST RESULTS, CAN YOU PLEASE TELLS US WHAT MAY BE GOING ON WITH OUR SON? THANK YOU