my brother just started dialysis and i wonder is it normal for him to sleep wher he cant be woke?

People with kidney failure have toxins in their blood that may cause them to sleep more than usual. However if he’s sleeping so soundly that he doesn’t wake up when you try to wake him, I’d report this the nurse and/or doctor right away. It’s possible that something else is going on and if they examine him and review his medications, they can figure out what is causing this and fix it.