Does sundowning ever go away if not how long can a person go without sleep?

We go through the same thing. He wants to watch TV but says they talk garbled or he does not understand what they are saying. He comes argumentative. but not combatative. I tried to get him to watch old movies. That worked for a while.

Some people with Alzheimer's experience this. As the sun starts going down, late evening, they get more agitated and want to walk and be active. Some may stay up all night and pace the floor or are awake and agitated all night. They need meds to help them relax and sleep.

What does sundowning mean please

...might be sundowing..