This is another example of a poor translation. A better translation (e.g. WEB) says:
For if God didn’t spare angels when they sinned, but cast them down to Tartarus, and committed them to pits of darkness to be reserved for judgment;
This is the only place in the Bible that the word tartarus is used. The Online Bible Greek Lexicon describes it as:
1) the name of the subterranean region, doleful and dark, regarded by the ancient Greeks as the abode of the wicked dead, where they suffer punishment for their evil deeds;
The Cambridge Bible notes says:
but cast them down to hell] Literally, cast them into Tartarus. The use of a word so closely bound up with the associations of Greek mythology is a phenomenon absolutely unique in the New Testament. A compound form of the same word had been used of Zeus as inflicting punishment on Cronos and the rebel Titans. (Apollodorus, Bibl. 1. 1.) Here it is used of the Almighty as punishing rebellious angels.
So you can't use this verse to suggest that human souls don't 'sleep' in sheol/hades, because the verse is referring to angels (not humans) who have not died and are being held by God in another place, not in hades/hell.
That mentions live people being destroyed in fire - it's not talking about hades/hell. The fallen angels are being held in a dark pit, just as Satan will be:
Revelation 20 (WEB):
1) And I saw an angel come down from heaven, having the key of the bottomless pit and a great chain in his hand.
2) He seized the dragon, the old serpent, which is the devil and Satan, who deceives the whole inhabited earth, and bound him for a thousand years,
3) and cast him into the abyss, and shut it, and sealed it over him, that he should deceive the nations no more, until the thousand years were finished. After this, he must be freed for a short time.
How can a pit be bottomless? Perhaps because it is at the centre of the earth, where the only direction is up!
Those dead humans under the earth, or sea, are not concsious:
Ecclesiastes 9 (WEB):
5) For the living know that they will die, but
the dead don’t know anything, ...
10 ... for there is no work, nor plan, nor knowledge, nor wisdom, in Sheol, where you are going.