lighten up a little (sky)

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ridgemao

Senior Member
Chinese - Mandarin
Hello:

At 4:00am, it is dark outside my house, at 5:00am, it is less dark outside my house, but the light is still very dim.

Can I say that the sky lightens up a little from 4:00am to 5:00am. Can I use "lighten up a little" here?

Thank you.
 
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