Re: GURPS Power-Ups 9: Alternate Attributes
The aforementioned Stress and Derangement rules function more or less like that: the Stress penalty is recovered at a rate comparable to Fatigue recovery and can be thought of as “psychic fatigue”, and the Derangement penalty is recovered at a rate comparable to The healing of HP loss, and can be thought of as “psychic hit points”. All that's needed are psychotherapy rules that are to Derangement as Physician is to HPs.
Even if you decide not to use those rules, you should at least review them, as they've already addressed a number of the issues that you'll want to address with your own Sanity system.
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