Cl-y: "Wh-t? -- - s-----e- t- be -slee- r-ght n-w? - c-n st-ll he-r y--. W--t, s--eth-ng's wr-ng. -- - s-----e- t- be -ble t- st-ll he-r y--?"
Used letters: T, E, S, R, Y, H, G, N, W, B, L, C
And nope, none of those have been used before. I like them, thanks.