"beggar1015;d-1008885" wrote:
She was afraid of everything - deep water, volcanoes, the ghost of Nancy Landgraab.
To be fair, I'd be afraid of the ghost of Nancy Landgraab, too. To answer your question though, this sounds like a really bizarre glitch. I haven't seen anything like it. Aside from infants' needs decaying quickly, as @GalacticGal mentioned, my sims needs seem to go down reasonably. They only get bored or stressed in response to something boring or stressful happening.
I don't own quite a bit of the DLC or any mods, so it could be some feature I don't have going haywire for you.