This riddle describes something that arrives on its own every evening and disappears again when morning comes. It does not need an invitation, a phone call or any human action.
The clue is in the natural cycle between day and night. As daylight fades, one familiar condition takes over, then disappears again after sunrise.
Answer: Darkness.
Darkness comes every night without being called and leaves every morning as daylight returns. “Night” itself is also a closely related answer, but darkness fits the wording especially well because it literally arrives as light fades.
Sometimes the simplest riddles are the ones hidden in everyday routines we barely notice.
