I think old English got the best of some people. To sleep is to die in kjv
ESV John 11:11 After saying these things, he said to them,
“Our friend Lazarus has fallen asleep, but I go to awaken him.” 12 The disciples said to him, “Lord, if he has fallen asleep, he will recover.” 13 Now Jesus had spoken of his death, but they thought that he meant taking rest in sleep.
14 Then Jesus told them plainly, “Lazarus has died, 15 and for your sake I am glad that I was not there, so that you may believe. But let us go to him.” 16 So Thomas, called the Twin, said to his fellow disciples, “Let us also go, that we may die with him.”
1 Thessalonians 4
13 But we do not want you to be uninformed, brothers, about those who are asleep, that you may not grieve as others do who have no hope. For since we believe that Jesus died and rose again, even so, through Jesus, God will bring with him those who have fallen asleep. For this we declare to you by a word from the Lord, that we who are alive, who are left until the coming of the Lord, will not precede those who have fallen asleep. For the Lord himself will descend from heaven with a cry of command, with the voice of an archangel, and with the sound of the trumpet of God. And the dead in Christ will rise first. Then we who are alive, who are left, will be caught up together with them in the clouds to meet the Lord in the air, and so we will always be with the Lord. ..