A new perspective
I will be assigning these three stats to my life:
1. HP - Energy
How it works: Depletes as long as eyes are open; can only be restored by sleeping. Feel energetic with high HP, when HP hits zero, system will operate a forced shut.
2. MP — Willpower
How it works: Depletes when doing things that go against your immediate desires; there is no direct way to restore MP. With low MP, can't cast abilities.
3. SAN — Emotion
How it works: Depletes when facing stress or when HP is low; increases when receiving rewards. High SAN increases crit rate, while low SAN prevents you from casting abilities.
A quick run of how common activities in my life affecting these values:
Gaming：HP ↓ MP → SAN ↑
Studying：HP ↓ MP ↓↓ SAN →↓
Eeping：HP ↑ MP →↑ SAN ↑
Job hunting：HP ↓ MP ↓↓ SAN ↓↓
Guitar：HP → MP →↑ SAN ↑↑
Music：HP ↑ MP ↑ SAN ↑↑
It's clear that, at this point of my life, given how my body works, being productive often requires a large amount of MP. This is sad, but its not the end of the world yet.