When I'm making plans, it's very easy for me to get overwhelmed by my current mental or physical state. This is especially a problem when I'm deciding how to allocate my time after class, because how I feel right after lecture is very different from how I feel an hour later.
If I'm aware of this, though, it's easier to manage time efficiently, because I can pace my activities based on how I'll feel while doing them, rather than how I feel when I'm making the plan. There's a degree of uncertainty, but trying to predict my mood later is a better heuristic than assuming my current mood is eternal.
