Description: When attempting to sleep, an attack is made against your Mental Defense and on a successful hit, you take 1d10 points of sanity damage.
This attack starts at 2k2 and increases by +1k0 for each failure, and +0k1 for every other failure. In addition to this, sanity damage you've already taken is added to this roll as a bonus (Stress and Sanity are added together for the purpose of this bonus).