I would agree, W has had depression off and on, in addition to SAD, and seems this has memory effects. She remembers "summertime" things much better than "wintertime" things...I hope she gets to the point like your SIL where she sees the state coming on and can be proactive.
And she just told me she is going to see Dr today to see about going back on wellbutrin, seemed to help last year some, and she knows that it isn't the "cure", just to take the edge off so she can move forward better...we'll see what happens, it did seem to help her move past the anger/spew stage, and she doesn't hate me anymore, soooo...lol...
But this is a nice self-initiated "action" step to see from her. She IS trying, which I have been good to validate all of her trying.
In the depths of winter, I finally learned that within me there lay an invincible summer. - Albert Camus
Uncertainty is the very condition which impels people to unfold their powers.-Eric Fromm