Well, it is likely that you did not stop breathing. During REM sleep, your breathing slows down and sometimes your brain interprets this as your not being able to breathe (People sometimes dream or hallucinate that they are being suffocated or strangled.)
It sounds like your brain was mixing upu waking and sleeping states at the same time, which sometimes happens.
Have a look at the pages on
sleepwalking,
out of body experiences, and
sleep paralysis.
Mixing up different brain states is much more common in children so it makes sense that this happened when you were young.