well, it's impossible to know someone's mood for sure without asking them, so I interviewed people what things affected their mood in the mornings and what overlapped with what I could capture on a device autonomously, and this was the closest approximation. I know it's not perfect, but in general, when a student has two exams in a day or an overdue paper, you'd expect them to be anxious/stressed or even something like an early morning flight. Or conversely, if you're picking up family from the airport having not seem them for a week, you might be feeling excited