They are usually closed at night (7)
I believe the answer is:
eyelids
(Other definitions for eyelids that I've seen before include "covers for lamps" , "covers for lights?" , "They drop in sleep" .)
I've seen this clue in The Guardian.
Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free.
Check out my app
or
learn more
about the Crossword Genius project.