Soul sleep?

What happens to our souls and spirits when our flesh bodies die? Some choose to believe that our souls and spirits are in the grave awaiting the return of Christ and the resurrection of our souls and spirits. I believe differently based on the following verses, among many.

1 Corinthians 15:11 Therefore whether it were I or they, so we preach, and so ye believed.
1 Corinthians 15:12 Now if Christ be preached that he rose from the dead, how say some among you that there is no resurrection of the dead?
1 Corinthians 15:13 But if there be no resurrection of the dead, then is Christ not risen:
1 Corinthians 15:14 And if Christ be not risen, then is our preaching vain, and your faith is also vain.
1 Corinthians 15:15 Yea, and we are found false witnesses of God; because we have testified of God that he raised up Christ: whom he raised not up, if so be that the dead rise not.
1 Corinthians 15:16 For if the dead rise not, then is not Christ raised:
1 Corinthians 15:17 And if Christ be not raised, your faith is vain; ye are yet in your sins.

Ecclesiastes 12:6 Or ever the silver cord be loosed, or the golden bowl be broken, or the pitcher be broken at the fountain, or the wheel broken at the cistern.

(What this verse is saying is, when these flesh bodies of ours die).

Ecclesiastes 12:7 Then shall the dust return to the earth as it was: and the spirit shall return unto God who gave it.

(Our spirits return to God).

1 Thessalonians 4:13 But I would not have you to be ignorant, brethren, concerning them which are asleep, that ye sorrow not, even as others which have no hope.
1 Thessalonians 4:14 For if we believe that Jesus died and rose again, even so them also which sleep in Jesus will God bring with him.
1 Thessalonians 4:15 For this we say unto you by the word of the Lord, that we which are alive and remain unto the coming of the Lord shall not prevent them which are asleep.

Prevent: G5348, fthan'-o; apparently a primary verb; to be beforehand, i.e. anticipate or precede; by extension, to have arrived at:—(already) attain, come, prevent.

Asleep: G2837, koy-mah'-o; from; to put to sleep, i.e. (passively or reflexively) to slumber; figuratively, to decease:—(be a-, fall a-, fall on) sleep, be dead; (The subject of the above verses is what happens when we die; death in other words. It is not about sleeping. Verse 14 refers to the death of Jesus). These 2 definitions are from a Strong’s Exhaustive Concordance.

Try the following website for a good explanation:

https://www.gotquestions.org/soul-sleep.html

Other pertinent verses in my opinion: Mark 12:27; Luke 16:19-31; 1 Corinthians 15:40-50; 2 Corinthians 5:6-8; Revelation 7:9; etc. I’m sure there are more.