And to think about how often such things are figured out individually, but go unnoticed, because there's basically 0 chance for the average person to get anyone to do a study on it.
My guess on some of this has to do with a few things. Hormone levels vary throughout the day along with immune system activity; My allergies are always worse in the morning than the day. I'm sure time is a huge component in a lot of medical things but I haven't personally seen any studies on this.
Most people also fast at night (sleeping) and are less physically active etc etc.
