>Dome of Illusion I'm not sure about because I don't know if
>there's an echo on a successful singing

This is FNCR.

>but Life's Tomb does
>not appear to work on sleeping people. I've attempted it on a
>cold-be-slept person probably 20 times and it has never
>worked, but it has while the victim was awake.

This is apparently by design (as in it is intentionally coded this way though I am not sure why)