go out like a light

go out like a light

To fall asleep quickly. I didn't even hear you come in last night—I was so tired that I went out like a light as soon as my head hit the pillow.
See also: light, like, out

go out like a light

fall asleep or lose consciousness suddenly. informal
See also: light, like, out

be/go out like a ˈlight

(informal) fall asleep very quickly or suddenly lose consciousness: She went out like a light after an exhausting day at work.One minute she was talking and laughing and the next minute she was out like a light. It was very frightening.
See also: light, like, out