Sleep was just an example for a freewill act not that they necessarily have to sleep
By the way, Islam does not say we will be spirits there. Beliefs imply that we will have physical bodies. At least in Hell people would, as those beliefs imply.
To which ' hell ' are you referring ?
The non-biblical hell, or the Bible's hell ?
Especially when the Jews began mixing with the Greeks they adopted their theories and philosophies and began teaching them as Scripture.
The non-biblical hell began being taught as Scripture although Not Scripture.
The KJV (King James Version) translated into English the word ' Gehenna ' as hell fire.
Gehenna was simply a garbage pit outside of Jerusalem where things were destroyed and Not kept burning forever.
There is No oxygen to burn people in the Bible's hell because the Bible's hell is simply mankind's stone-cold grave for the sleeping dead.
The day Jesus' died Jesus went to biblical hell - Acts of the Apostles 2:27; Psalms 16:10
Since Jesus taught sleep in death - John 11:12-14 - then Jesus knew he would be in an unconscious state until God would resurrect Jesus out of biblical hell (grave)
Jesus was well educated in the old Hebrew Scriptures which also teach sleep in death:
Please notice -> Psalms 6:5; Psalms 13:3; Psalms 115:17; Psalms 146:4; Daniel 12:2; Daniel 12:13; Ecclesiastes 9:5
Everyone Jesus' resurrected from the dead had physical bodies.
The Bible's hell comes to a final end according to Revelation 20:13-14
After everyone in hell is ' delivered up ' (resurrected) out of biblical hell, then emptied-out hell is cast vacant into a symbolic ' second death ' for vacated hell.
While on Earth Jesus was giving us a preview, or coming attraction, of what Jesus will be doing over Earth during his coming 1,000-year governmental rulership over Earth.
The majority of people will be brought back from death's sleep to a happy-and-healthy physical life on Earth - Revelation 22:2
As far as the wicked, they will be ' destroyed forever ' - Psalms 92:7
Jesus will destroy Satan - Hebrews 2:14 B
Satan ends up in ' second death ' - Revelation 21:8
So, ' second death ' is a fitting term for destruction.
The righteous to gain everlasting life, the wicked are destroyed in everlasting 'second ' death.