Update

I talked to our doctor today. He says that we have to keep on eye on him at night to see if it happens again. It could be sleep apnea, or night tremors or on the rarity there is some kind of seizure that it could be. But that is completely rare. So I have to let him sleep with us for a while and see what happens. If it is apnea - it won't necessarily happen to that extreme every night.

What happened when he was in NICU was what he would say was sleep apnea but since it was while he was in the NICU so long ago - he can't count it in the evidence of symptoms. Now we just wait and see what happens!