"Sleep" is a metaphor for death. When Jesus said Lazarus was "asleep" he meant he was dead.
11:11 These things said he: and after that he saith unto them, Our friend Lazarus
sleepeth; but I go, that I may awake him out of sleep.
11:12 Then said his disciples, Lord, if he sleep, he shall do well.
11:13
Howbeit Jesus spake of his death: but they thought that he had spoken of taking of rest in sleep.
John 11:11-13
Then said Jesus unto them plainly, Lazarus is dead. Verse 14
See what I mean? Sleep in this context does not mean one is alive and dreaming. It means they are dead.
Then the rest of the story of Lazarus confirms none of what you are teaching but rather their hope was Lazarus would be raised at the last day.
11:24 Martha saith unto him, I know that he shall rise again in the resurrection at the last day.
John 11:24