Question

what is the meaning of "happy memories light up a life that is nearing its close"

Answer 1

it means that some good memories can again fill your depressed life into a happy life.

Answer 2

Happy memories is a reference to the stars in the sky which are visible during the time when surise is about to commence. The writer here compares dawn or early morning to a new life and night is compared to end. He says that in a life which is about to end i.e night, memories signified by stars are the source of happiness.