If another character wakes you up to talk with you, any attempts to use [C]hat command will cause the game to briefly fade out to black and add "You wake up to someone talking to you", despite no one talking with you. This will keep happening until you actually chat with someone or go to sleep again.
It's easy to reproduce:
Go to a village while slightly tired. Pick up any owned item. Go to sleep. A villager will wake you up requiring payment. It doesn't matter which option is chosen. Trying to use [C]hat command now will cause the screen to fade to black and display a message about someone waking up the player.