Good morning First off and again, Rev is a highly symbolic book.
The account of seeing souls under the altar who speak isn't symbolic.
But even with that aside, that one verse does not say they were conscious the whole time of them waiting.
Many other verses say those who are saved and pass on sleep in Christ. Sleep is not a euphemism for wakeful awareness as so many claim. I mean really, the idea that is, is is outlandish.
Nothing more or less.
The notion that the soul sleeps is nonsense.
Consider what Jesus said about Lazarus in John 11 -
11 After he had said this, he went on to tell them, “Our friend Lazarus has fallen asleep; but I am going there to wake him up.”
12 His disciples replied, “Lord, if he sleeps, he will get better.”
13 Jesus had been speaking of his death, but his disciples thought he meant natural sleep.
14 So then he told them plainly, “Lazarus is dead,
Now, if you can find where Jesus was speaking of "soul sleep", please be my guest and point it out.