A: I’ve been feeling so exhausted since I took my present job last year.

B: Of course you feel burned out — there’s no daylight between your work life and your personal life.

Note: This saying means “very closely related or intertwined.” During the day, if two persons stand side by side, we will see the gap of light in between the two. Therefore, daylight here refers to “the distance or difference between (people or things).” For example: The team has won five straight games to put some daylight between themselves and their nearest rivals. This means “there is quite a gap between this team and their nearest rivals.”