This episode could have been an aborted seizure
. Sometimes a seizure starts and doesn't go on to the full typical attack and stops early and that is called an aborted attack. It means that the medications you are taking is not adequate for you. For a good control even aborted attacks should not occur. And on other hand it means that the medication is acting and thats why you didn't have full attack. I don't think it has anything to do with holding breath while sleeping.
You can visit your neurologist
and he will advice the necessary change in medication.