I'm assuming you don't feel comfortable going to sleep first and leaving him awake. No telling what shenanigans he might get into. The number of hours my husband (ALZ) clocks is astounding compared to my measly 7-8 hours if I'm lucky. He goes to bed by 9p, up for breakfast about 10am and then goes back to bed. Yesterday he didn't get up until after 3pm. He has no trouble going to sleep. The only RX he takes is mirtazapine, an antidepressant. I'm not sure if it is his brain needing to be reset; or he just doesn't see any reason to be up. He has lost all interest in any activities. He always slept way longer than I did; but this is extreme. I've been having some pressure about moving him to a memory care facility. He tells me he is happy here and feels he has had a busy day even though he hasn't. I'm staying the course for now. I think your feeling tired is more about the emotional drain this disease puts on the caretaker than the number of sleeping hours. This is tough sledding.