When it happens
Why it happens
As language skills decline, it may become harder to express complicated feelings. When the person is upset, scared, or feeling insecure, "home" represents a place of security and happiness.
What you can do
Don't necessarily take it literally. "Home" is often more of a concept of warmth than the person's current home. Often people with dementia refer to a childhood or past home as if it's where they live now.
Don't necessarily take it as a condemnation of current living quarters. Someone in a nursing facility may not literally mean they want to leave with you, but rather that they're upset about something that can be fixed: a brusque aide, being cold, feeling hungry.
Soothe by inviting, "You really miss home. Tell me about home."
If you think the person is still verbal enough to want to revisit a particular home, you can try this -- but be prepared for the possibility that even a favorite former home will not be remembered