I agree with
@Antje77. I test my fasting level as soon as I wake up, even a year from diagnosis it’s always slightly higher than my going to bed reading. The difference is less than at the beginning though. I always then go and eat breakfast straight away, showering and dressing waits til after I’ve eaten. As recently as Feb. I tested what happens if I don’t eat straight away, on the morning of my blood tests when I was fasting. My level just crept up and up til I ate. I also eat a low carb fatty snack before I go to sleep too, usually 30g nuts, that is supposed to help fasting levels too.
Many of us have written that the fasting reading is the last to settle down because that’s exactly what we’ve found, me included!