@pritj Welcome to Mayo Clinic Connect! I am 50 years diabetic and can relate to the concerns you expressed. As I read your post three things came to mind:

1) you mentioned rice. For whatever reason not all carbohydrates are equal. Mathematically this makes no sense. Dieticians have done a deep dive and attempted to explain this with something called the glycemic index. I find it super confusing and don’t want to go there. A simpler way of looking at it is that the same amount of carbohydrates from say rice, pasta, potatoes may have a different result on your body. For example I find that rice will raise my blood sugar faster and more than an equal amount of carbohydrates from potatoes. This could also be an individual thing and it might be helpful to scope it out personally. It is really tedious but you can keep a food diary plus pre and post prandial (before & after eating) blood sugar records for a few weeks. You eat the same things throughout the day for several days (boring!) then switch it up for the next few days. It can help you learn how to identify what foods present more problems for you. My nemesis turned out to be rice and pasta. I still eat them but REALLY limit the frequency and also the portion sizes when I do so.

2) & 3) Morning blood sugars can be affected by two things that can occur during the early morning hours of the night. One is called the Dawn Phenomena the other is called the Symoji Effect. I can’t remember the difference between the two at the moment but it has something to do with your metabolism waking up in the morning and your body raiding glucagon supplies from your liver to prevent the sensation of starving. You can look up these two things for a more complete explanation. Both of these can cause morning blood sugar elevation.
I may have spelled Symoji incorrectly. Siri and Miriam Webster aren’t being helpful at all. They kept giving me “emoji”. It is a medical term outside of their expertise. The same thing happened with “prandial” when I tried to check that spelling. They were insistent on telling me “perennial”!