Dreams

In multiplayer, while resting in bed, waiting for the other player, little sleep animations play. In the same style as the chibi characters for the marketplace cover button. Some dreams could be the player (Steve) getting blown up by a creeper, beating the Ender Dragon, building a base, or even finding diamonds. I think it would be interesting to basically dream in Minecraft, as well as calming many players down while waiting for their friends to sleep. It could bring whimsy to sleeping.