@daisymae, I experience this same exact thing!! Bg starts to go up 2 or more hours later. It is consistent for me because I eat similar food each night.
I’m pretty sure in my case, the issue is bolus related, as @Eric suggested, because during a multi day fast, I did not experience the high.
I’ve tried all three methods mentioned by @Eric. I trippled by basal 6-9 pm. That works BUT occasionally I do not get the upward trend, then the low is long and severe.
I’ve also tried multiple boluses during these hours. Usually one or two boluses prevent the high, but this requires constant monitoring of Decxcom and or fingersticks, and sometimes I miss the rise.
I’m now trying extended bolus. This is useful because I can always cancel the extended bolus if I start to go lower. So far, it is working pretty well but it takes a lot of tweaking. At least with extended, I can mostly prevent the lows caused by triple basals. And it requires less constant monitoring and timing than multiple bolused. I found that I still may need a separate bolus though.
As to why this upward trend occurs, I’m not really sure. Someone said it could be the protein in the meal. I do usually have a small amount of fish, and cheese, so maybe it is the protein.