[eimrine]

> Reduce my workouts from three 1h workouts to two 1.5h workouts.

You need to set a goal for this and see if you goal has been reached. For example, do you really spend so much time going to gym and from gym that you are going to perform less (because of fatigue)? Or maybe vice versa - you do not like warming so much that you really need 1.5h instead of 1h but do not have an ability to spend 3*1.5h in gym.

> Start taking magnesium supplements for better sleep.

Define days or circumstances when you are doing this and see if you need your magnesium.

> I wonder whether there is a good resource or your anecdote about how to try the "scientific method" on yourself.

Maybe you need to read a definition of "experiment" for doing your lifestyle experiments more like real experiments from science.

[fuzzfactor]

You've got to think like a guinea pig first & foremost.

You're already expected to be a research program designer.