The Sims 3: Why is the Sim so unhappy

sims-3

As is visible in the screenshot below, my Sim has all their needs met and no negative moodlets, yet their happiness level is pretty much stuck to miserable. Is this a bug, and if so, how do I fix it?

Screenshot

Best Answer

Supposedly this is due to a bug that causes the well rested moodlet to apply a permanent negative mood effect, instead of a temporary positive one. At least this is according to this fix. I use this fix and it does seem to make the mood work correctly.