They fell asleep under the stars.
Meaning: They slept outdoors while looking at the stars.
Choice of Words: Fell means to move suddenly and freely downward. Asleep means in a state of sleep. Stars are celestial bodies that emit light. When you put them together, "Fell asleep under the stars" creates a peaceful image of the girl and her friends drifting off to sleep surrounded by the beauty of the night sky.
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Related Expressions