A brief rally at end of life: what does it mean?

Sometimes we see a brief rally at end of life, what does it mean?
 
“Mr. Mastrojohn speculates that the social support at a hospice can give the chronically ill more pep than in a sterile hospital where they’re hooked up to machines.
 
Then there’s a spiritual or psychological component, which defies scientific explanation. Hospice professionals note a compelling desire to say goodbye or bond with loved ones in those last moments. There’s no way to test this hypothesis, but there’s no way to falsify it, either.
 
“People know when they are dying. They have this internal gut feeling that tends to expand at the end of life, and they seek a strong final connection,” said Dr. Bull.