Do people with early stage Alzheimer’s nap frequently?

Agree with driving being concerning.

But since you're asking about the sleeping, did it come on quickly or gradually? Is he on any meds that could cause him to be tired like this? Maybe it could be depression, as said by others.

Maybe his AZ is progressing a bit?

Good luck.

The napping could be from depression. I would discuss this with him and his doctor. Just another observation about his driving... have you gone out with him as a passenger lately to see first hand what his abilities currently are? Most likely he won't report any worrisome incidents to you. There may not ever be any clear signs that he should stop, except to know that day is coming sooner than later for him, for everyone's safety. My uncle went through a red light and was t-boned, which killed his wife and dog and fortunately spared the people in the other car. My MIL was having short-term memory issues and accidentally hit the gas instead of brake, making her crash into a stop sign very near where school kids were standing and waiting for the bus. She didn't know how or why it happened. Her van looked like it had been in a pinball machine and we realized she was having more incidents than we realized.

I don't know that I would be overly concerned about your husband's napping as much as I would be over the fact that he's still driving. You say that he is "very forgetful." Are you not worried that he might just forget where he's going and how to get home? Or worse yet, that he might kill or injure some innocent person, because of his confusion? I would be talking to his Dr about having his license taken away ASAP, and while doing that, you can also ask about his napping all the time. You now must do what is in the best interest of your husband's safety, and yours too. It's not easy, having your spouses license taken away, I know. Been there done that. I wish you the best.