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There is no sleep in Heaven since there is no night there: "There will be no more night. They will not need the light of a lamp or the light of the sun, for the Lord God will give them light. And they will reign for ever and ever." (Revelation 22:5)
magix151
I don't know, I'm no angel.
Gman
Angels are spirits and don't have a physical body that need sleep to heal itself.