thanks for this...very helpful..I will test tomorrow before i get up although in fairness I don’t sleep very well, usually waking every couple of hoursThere are far more things than just food which affect your BG levels and they normally fluctuate throughout the day even in a non diabetic person. Fasting readings are often higher than any other time of the day. This may be down to something called Dawn Phenomenon or Foot on the Floor syndrome where the liver pumps out some glucose as the day starts and we get up, to help us start our day with plenty of energy. It is believed to be a throwback to prehistoric days when we didn't have cupboards and fridges containing food and needed energy to go out and hunt or forage for our breakfast. It can raise your levels by as much as 5-6 mmols if you are very unlucky and with some people it starts to happen in the early hours whereas with others like myself it waits until I swing my feet out of bed and stand up. If you test your BG first thing on a morning before you get out of bed, you might find you get better readings than after you get up and visit the bathroom and maybe sit down with your morning cuppa to test then. Diabetics often find that their fasting level is the last reading to respond to their dietary changes and start to come down. i find exercise will make a big difference to my overnight and fasting readings so that might be something to experiment with. Nothing desperately exertive, but a brisk daily walk if you can manage it should help.
Your muscles are actively burning up energy and sucking glucose out of your blood for fuel during the day even without formal exercise as oppose to using much less when you are in bed sleeping on a night.