The soul is not dead nor sleeping when the body dies. No souls literally or symbolically sleep after death. Both good and bad, saved and unsaved are fully alert after death.
Souls do not sleep. Sleep is only something a mortal body does. Even when a person's body is asleep their mind (soul and spirit) are not asleep. Even someone in a coma is not asleep in mind or spirit.
The Sadducees believed like some, that when a person dies nothing is left living...only difference is the soul death/soul sleep people believe in a future resurrection while they didn't.
Christ rebuked the idea that a person was fully dead after physical death here:
Mat 22:29 Jesus answered and said unto them, Ye do err, not knowing the scriptures, nor the power of God.
Mat 22:30 For in the resurrection they neither marry, nor are given in marriage, but are as the angels of God in heaven.
Mat 22:31 But as touching the resurrection of the dead, have ye not read that which was spoken unto you by God, saying,
Mat 22:32 I am the God of Abraham, and the God of Isaac, and the God of Jacob? God is not the God of the dead,
but of the living.
Abraham, Isaac and Jacob were ALIVE despite having died physically.
Mar 12:27 He is not the God of the dead, but the God of the living:
ye therefore do greatly err.
Ye therefore do greatly err anyone who believes in this soul sleep false doctrine.
Luk 20:38 He is not a God of dead, but of living men,
for to Him are all living."
Biblical ignorance always causes incorrect man made doctrines.
2Co 5:8 We are confident, I say, and willing rather to be absent from the body, and to be present with the Lord.
2Co 5:9 Wherefore we labour, that, whether present or absent, we may be accepted of him.
No one is dead or sleeping in heaven with the Lord.
Luk_23:46 And when Jesus had cried with a loud voice, he said, Father,
into thy hands I commend my spirit: and having said thus,
he gave up the ghost.
The spirit goes to God!
Rev 1:7 Behold, he cometh with clouds; and every eye shall see him, and they also which pierced him: and all kindreds of the earth shall wail because of him. Even so, Amen.
Every eye shall see him, even those that had pierced him though they died long ago. If they were asleep or dead they couldn't witness his return!
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:
Rev 6:10 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?
Here John seeing a future event in heaven and he sees the souls of the dead and they are fully alert and talking. They are not sleeping nor are they dead!
Isa 14:9 Hell from beneath is moved for thee to meet thee at thy coming: it stirreth up the dead for thee, even all the chief ones of the earth; it hath raised up from their thrones all the kings of the nations.
Isa 14:10 All they shall speak and say unto thee, Art thou also become weak as we? art thou become like unto us?
How can the dead ask such a pertinent question if they are asleep?
At physical death only the body is dead, nothing else is dead at that time. The counter argument is a remnant of the old errant Sadducee belief that everything was dead when a person bodily died. Christ spoke against that belief and corrected their error yet their belief still exists today in modern Sadducees and Atheists.
All scriptures that speak of the spirit/soul of the dead show them to be fully awake.
A great article on this subject:
https://carm.org/soul-sleep
What is soul sleep?
by Matt Slick
Soul sleep is the teaching that when a person dies, his soul "sleeps" until the time of the future resurrection. In this condition, the person is not aware or conscious. The Jehovah's Witnesses and the Seventh-day Adventists hold to this doctrine. But the Jehovah's Witnesses teach annihilation. This means that after death, a person ceases to exist. At the future resurrection they maintain that the soul is made again. Basically, it is a re-creation of the individual. The Seventh-day Adventists teach that the soul is simply inert and resides in the memory of God.
The primary verses used to support soul sleep are found in Ecclesiastes:
Eccl. 9:5, For the living know they will die; but the dead do not know anything, nor have they any longer a reward, for their memory is forgotten."
Eccl. 12:7, "then the dust will return to the earth as it was, and the spirit will return to God who gave it."
Ecclesiastes must be understood in the context of its own commentary, which says at the opening of the book, "The words of the Preacher, the son of David, king in Jerusalem. 2 “Vanity of vanities,” says the Preacher, “Vanity of vanities! All is vanity.” 3 What advantage does man have in all his work which he does under the sun?" (Eccl. 1:1-3). The writer is telling us how things are from the human perspective from "under the sun." He is not telling us doctrinal statements about whether or not the soul continues after death. Besides, it's a mistake to use the Old Testament to interpret the New Testament. It is the New Testament that sheds light on the Old Testament.
In the New Testament we see Paul say in 2 Cor. 5:8, "we are of good courage, I say, and prefer rather to be absent from the body and to be at home with the Lord." Paul is clearly telling us that when he dies, he will go and be with the Lord. Furthermore, at the Transfiguration of Jesus (Matt. 17:1-8), we see Moses and Elijah who were alive. There was no soul sleep with them.
Therefore, the doctrine of soul sleep is incorrect. The soul continues on after death. The wicked face the judgment of God, and the Christians will dwell in His presence.
Both groups are in error about soul sleep.