In my experience
When you first wake up, is a very unique time of day.
As you wake up all your hormones are kicking in, to get you ready for the day.
Seems unbelievable, but even if you do not eat breakfast, you will find your sugar level shoots up dramatically.
In my case it is to the extent that even if missing breakfast, I need a bigger dose of insulin than I take before all other meals during the day, this is just to cope with this waking up jump.
I have been type 1 diabetic since age 12 (for 42 years) and was unaware of this myself until getting a Dexcom continuous metre six months ago.
The Dexcom really brings home the importance of injecting 25 minutes before eating. You see dramatic spikes on the display if you don't.
The continious meters are expensive but I believe most Health care providers have demonstration ones that can be trailed for a week or so, it would certainly be worthwhile if you can get a trial, opened my eyes no end,
i can confirm that the Dexcom continious sensor although supposed to last only 7 days last far longer. I'm averaging three weeks use from each (£65) sensor (the least time I have got was 13 days lhe longest time a sensor has lasted, well that's the one that Im currently using, now been in for an amazing 35 days that's well over a month for something that is only supposed to work for 7 days and it still going strong)