Oh, I see. Still, I think having some control over the outcome of your traits would be a great gameplay mechanic. When you dream the game essentially would teleport you to a structure/dungeon, you have to find something, kill something, craft and place something, whatever you think the ominous dream might want you to achieve. Failure to complete within the time limit, you wake you up without a new mutation. If you die or do something horribly wrong or against what the dream was really trying to get you to do, you gain a negative mutation. Should you kill the beast, solve to puzzle, convince the lost npc to follow you, whatever it might be, you get a positive mutation.