Perchance to Dream

Every time you sleep, you have a 60% chance to have a dream— a flavorful message that briefly describes what you dreamed about, from sailing a vast ocean to a great tree half frozen and half burning. Of those, 10% are good dreams that will confer a buff upon waking and 10% are nightmares that will give a debuff.

Dream chances are configurable.
If you'd prefer not to have nightmares, you can change the chances to 0.0
Dream messages are also configurable, so you can add your own, or get rid of ones you don't like.

See if you can catch all of the references!