By default I'm actually very low energy. Always have been. I recall my dad admonishing me many times in adolescence that he'd take me to the doctor and they'd prick me with needles if I didn't stop napping during the day.

Somewhat circularly, it's the system itself that gives me the energy to keep using the system. I know, because I've engineered it to work that way. (At first this wasn't intentional, but when I noticed the positive effects in an earlier version I systematically began to tease out those effects.)