You can get the moodlet manager LTR. Here is what it does:
The moodlet manager places a device in your Sim's inventory. You can use the moodlet manager to cure your Sim's, or their friends' ailments. If your Sim has a negative hungry moodlet, the manager can cure that by raising the bar to full. Likewise with energy. Unfortunately, you won't get the 'had a good night's sleep' or 'excellent meal' moodlets from using this. I did seem to get the squeaky clean moodlet however.
If the moodlet manager fails, it can immediately make your Sim exhausted. This is not a problem at all, as you can immediately use the cure option once more to fix that problem until it succeeds. With the moodlet manager, you may never again need to sleep or eat. Sims can stand at the riverbank fishing for 24 straight hours without breaking a sweat, as any time a need comes up it can immediately be fixed.
from Carls sims 3 guide.
