After a character sleeps the game makes you do a yawn emote, but no sound comes out, so what if after you rest a yawn sound is spawed at the players location then destroyed after it has played? It would just make the sleep animation a little better, check for gender and if male spawn a masculine yawn, if female spawn a feminine sound.
Related to sleep, I really like the sleeping animation on a bedroll but it's over with way too quickly owing to our sleep duration. Since we have a rest option as well as a sleep I sort of think it would make a better distinction between the two if the sleeping lasted a little longer than rest, since it heals more and you get more benefit out of it.