On your home page, you'll notice the bars "health" and "mood". These are representative of - you guessed it! How you're feeling. You'll probably notice this stays at a strict 60% balance. That's because you've not set your priorities to be higher.

Every night at 10 minutes before midnight, you receive 600 Bux for your breeder services. Of this, some money is spent on keeping you alive. The money spent is called "priorities". You're tallied up for how much each priority costs to maintain every night. So you make 600, and spend some on fancy food and never bored entertainment. 600 - 150 (normal basic needs) - 300 (fancy food) - 300 (never bored) = -150. So you lost 150 bux that night, however you also gained some mood and health.

You can live finely, at 60% of both health and mood, with just 150-bux priorities. However, 60% health will make it hard to sacrifice well for single-splice monsters, and under 70% offers no mood boost to monsters in battle. It's generally considered if you're going to move up a tier, that you do it all at once and not just add luxurious basic needs to trashy food. In fact, if there are two tiers apart from each other, the lower tier will negate the higher. The in-game reasoning for this is that just because you spend 750 bux staying warm and having nice clothes doesn't mean that eating scraps for food isn't going to make you magically you shoot up to 70%. So once again, if shooting for new tiers of health and mood, it is advised you set all priorities to the next tier also.

Tiers

300 Bux/night - max 70% for both health and mood
500 Bux/night - max 80% for both health and mood
750 Bux/night - max 100% for both health and mood

Note: 90% is also a tier and can technically be achieved by choosing only two top priorities.

Mood Boost

Your mood, like the real world, can affect everyone else's mood around you. In this case, your monsters'. For every tier you achieve, your super amazing mood works towards raising your monsters stats every round. There is no status message, it just happens. The increase is very small but does happen before all stats are factored in. So if you were to gain 1% from good mood, it wouldn't add to the 10% battle cry if you have one, the 10% battle cry would be added onto the static stats. (you still with me?) The mood boost is relative to how much mood you have exactly, but it should be noted that if you do seriously drop 2250 Bux nightly for 100%/100%, you will have a +5% total base boost over stats. Also, if you have less than 40% mood, you'll lose a bit of stats each battle. (gets worse the lower you get) But seriously, less than 40%?

Breeder Experience

*huff* *puff* Finally, you get some breeder experience every night. Your health + (your mood / 2) = how much you get.