Hiya Tab... Welcome to the group! (Though, as Jennie always says, "sorry for the reason" )
Are you new to (what sounds like) Type 1 Diabetes? If so, you could be going through what's called, the "honeymoon period". Your body might still be producing insulin and causing some of the roller coaster ride for you.
How've your HBA1Cs been? Are you following any kind of eating plan (Dietician/Nutritionist recommended?)?
When it comes to insulin injections to compensate for food ingestion (Novolog), maintaining control can come down to: timing and area of injection, carb to insulin ratios (C:I) being different at different times of day, splitting your Levemir to suit your body's natural circadian rhythm instead of a 24-hour clock (i.e. 7:30AM & 10:30PM), how much & when you exercise, how balanced your meals are (protein/fat/carb ratios), and how often & when you eat. Oh yes, we can't forget to factor in whether Jupiter's moons are in alignment or not, too! Just kidding - it just can seem like that sometimes
The CGMS results should help you figure out your body's rhythm and I:C ratio for each of your meals and snacks, as well as identifying nightime lows and DP. I was "tested" on a CGMS for a week and it was neat to see the results. I'm kind of a keener about
metrics and stuff ("what's not measured is not managed") so the numbers provided me with some valuable info.
To help with some of your questions... bottoming-out at 3:00 is usually a sign that your evening Levemir shot may be too much or timed improperly. Do you take them 12 hours apart? What's the dose for each? Do you take any Novolog with an evening snack? BTW, your snack is high in quick-acting carbs and not high enough in the fat & protein department (meaning: spike & crash and probably why you see 230's at bed time and have lows in the middle of the night). Cheese, peanut butter, nuts, meat, eggs, (along with some carbs), would help with both the crashing and the DP. At night you're looking more to maintain a good glucose level than to have it spike & dip.
A good book to read is, Gary Scheiner's: Think Like a Pancreas - A Practical Guide to Managing Diabetes With Insulin. Another option to think about
is an insulin pump. Some folks found their management (much) improved by it.
I'm currently at that point. Going next month to actually pick out the pump and might be on it as soon as June. I'm one of those "brittle" diabetics (although an outdated term), whose BGLs are highly unpredictable and vary widely at any given moment. Just passed my 4-year anniversary and my Diabetes Team still look at me as a case study
I also found out that it was in my best interest to learn all I could about
how to manage this thing myself. I learned about
food, metabolism, the endocrine system, tools, research, history, basically anything I could get my hands on - still do. It took a while for some things to sink in but when they did, so many other things became clearer. Lots of testing and daily recording of everything have helped me tweak my regimen as best as possible. The understanding that I am the one who controls the quality of my life, from one hour to the next, was also a compelling argument for me to start learning how to be an artificial pancreas from now on. Learning about
diabetes is like learning about
quantum physics, you can't learn it overnight and you can't start anywhere but the beginning; it's a process. One that can also lead to enlightenment about
so many other things