I was also thinking that for those of us with older dogs who ALSO have younger dogs, the younger dogs may often wake the older dogs up with barking when they would have slept through, otherwise. My husband had to go to the hospital in an ambulance late at night last week. (He’s OK, got home last night) but there was quite the commotion, with flashing lights and about 10 strangers in the house, etc., Then I went off to the hospital, not to get home again until about 2AM. Poor Kodi. All the other dogs got up around 7AM and wanted to go out and have breakfast. By 11AM, I was worried about him, and went up stairs and woke him up… (he was fine) and brought him down stairs, fed him and let him out to potty. He then went to his fluffy bed in the dining room and slept for the rest of the day! WAY too much excitement for the old boy!!!