Ok he's just a baby who had a trama start so sleeping a lot doesn't surprise me. If the nose is doing it then he could have something jammed up there or blocking it.
Let me know if he can hold his head up.
AWE, yeh you can't put him back with the others until he's older. YOUR HIS MOMMY, CONGRADULATIONS.. LOL
Pics when you can !! glad to hear the lil one is doing so good