Call your doctor.
You are in danger. If you’re dropping in your sleep you’re over medicated.
Successful diabetes treatment is a balancing act between medications and therapies that lower blood sugar on one hand, and our intake of food on the other hand. Once balanced, it works pretty well, but sometimes getting that balance right is quite a trick. If you are going low in your sleep, we haven’t figured out that magic balance yet (or something has changed—maybe you lost weight or are eating less).
Low blood sugar is always dangerous, but especially at night. You need to hook up with your medical team right away. In the meantime, eat a snack at bedtime as anti-low insurance. Half a peanut butter sandwich is a good choice. Unless you don’t like peanut butter. You want something that is somewhat high-carb, but also high in fat so that it lasts a long time. Chocolate is another good choice, except that your spouse will refuse to believe that it’s “medicine.”
You want to avoid super-fast sugars in this case. A glass of juice would be a poor choice.
But an evening snack is a patch. An emergency measure. It's unacceptable as part of your long-term therapy plan. You shouldn’t have to feed your medications.