My husband had viral encephalitis in 2011. Now, ten years later, he has dementia and also sleeps a lot. He will do things like set the table or help me carry in groceries, when I ask, but otherwise dozes in his recliner during the day and then sleeps at least 10 hours per night. I’m going to ask his neurologist about it when we see him. Lou always liked his sleep, but this is a lot more sleep than ever before. I’ll post what the neurologist says, later. I am concerned, to say the least and do not know what, if anything, I can do.