I have always been interested in what my blood ketone levels would be in my habitual state of eating. I have eaten 'keto' at various stages through the last twenty years, mainly as an experiment, and sometimes for long periods (months or even years at a time).
I haven't been particularly 'strict' though because I get bored...
Overall I'm still pretty low carb in general. One of the reasons I typically eat low carb during the day is that it allows me to eat more carbs at night!
This is something I've been doing for many, many years. Nowadays people call it carb-backloading...I always called it having my cake and eating it too!
What I hadn't ever done previosuly is measure what this eating style meant in keto terms.
And so, for six days I charted my morning (awakening, fasted) serum betahydroxybutyrate (BOHB) levels, and tested again in the evening, before my main meal (dinner).