My husband 75 yrs old, DX d three years ago, has just today begun something and I do not know if we should worry or let it run. He slept for 18 hours last night to today and is still unable to stay awake, falling asleep mid-sentence, on the toilet, etc. This is not something we have faced before and I am trying to figure if he needs to go to the ER or should I just let him sleep? I cannot find anything, yet, online that gives me information about this. Thank you for any help . Cathy Hume