I Looked Over At My Husband Because He Was Making

I looked over at my husband because he was making an odd sucking sound I said his name he was drooling and his lip was hanging down un naturally I kept calling his name and he mumbled something but seemed unresponsive to me at all. I was driving at the time and dialed 911 but we were in a remote area and no one answered. He came back and says he does not remember it at all and is fine. It went on for about a minute. It scared me.