My Husband Sat Down On A Couch And Few Minutes

My husband sat down on a couch and few minutes later he started snoring. Within a minutes he started snoring very lound so I checked him out and I found out that he was passed out. His eyes were open and it seemed he was looking at something 45 degree angle above his eye level. I touch his wrist and I found out he was sweating. He came back after few minutes and asked what I was doing, but he seemed still drowsy and 1-2 minutes after that he was fully alert and I would like to know what caused him to do that. He seems all right and he said he is feeling fine. He was eating dinner and passed out about one year ago so this is his 2nd time passing out., but he was not snoring loud last time. Do you recommend me to take him to Emergency room?