As I view it... angels are spirits but still have a materiality to them. Yes, we do put off our body and will receive another but our spirits still have a materiality to it.
Mark 9:4 And there appeared unto them Elias with Moses: and they were talking with Jesus. - Elias a Moses were not "sleeping" and yet for sure Moses didn't have a physical body.
2 Cor 5:6 Therefore we are always confident, knowing that, whilst we are at home in the body, we are absent from the Lord: 7 (For we walk by faith, not by sight
8 We are confident, I say, and willing rather to be absent from the body, and to be present with the Lord.
This doesn't give the understanding that it is later but simply to be absent from the body is to be present with the Lord.
Matthew 22:32 I am the God of Abraham, and the God of Isaac, and the God of Jacob? God is not theGod of the dead, but of the living.
Doesn't say sleeping but the living.
Luke 16: 22 And it came to pass, that the beggar died, and was carried by the angels into Abraham's bosom: the rich man also died, and was buried; 23 And in hell he lift up his eyes, being in torments, and seeth Abraham afar off, and Lazarus in his bosom.24 And he cried and said, Father Abraham, have mercy on me, and send Lazarus, that he may dip the tip of his finger in water, and cool my tongue; for I am tormented in this flame.
Not sleeping, but talking and feeling (though not with their natural bodies)
Rev. 6:9 And when he had opened the fifth seal, I saw under the altar the souls of them that were slain for the word of God, and for the testimony which they held: 10 And they cried with a loud voice, saying, How long, O Lord, holy and true, dost thou not judge and avenge our blood on them that dwell on the earth?
No new bodies yet, but definitely not sleeping.
Anyway, that is just my viewpoint.