Was slept by a bard. Other people in the room said some things and I couldn't hear them because I was asleep. Afterwards I used the "afk" command and could see the things were said in the room (using the "say" command) while I was still slept.

Credit to Umi.

If you're in a room you won't be able to afk whispertos.
If you're asleep, you won't be able to afk whisper/say/sayto.