Idea for Science Project

A few weeks ago, my son felt a bit sick. He was asking to take his temperature often. This led to an idea for a science project. I suggested he take his temperature every hour, then write down the temperature and, time of day, and what he had been doing.

He wasn't interested in doing that, but it still seems like a good science project to me. I think a few hundred years ago, some diligent fellow weighed himself constantly -- I think he had some sort of sling that he stayed in most of the time -- and recorded his activities, as well as dutifully weighing and classifying his intake and, um, output.