Good question. Every type 1 diabetic reacts differently to insulin. Here’s what I’ve seen with myself. I can speak with more detail since I began using the freestyle libre device that lets me check my blood sugar with my phone. That app plots a graph of my blood sugar so I can see my level at any point over time. This helped me discover that I have the “dawn effect.” This is effect causes my blood sugar to spike overnight when I’m asleep and haven’t eaten anything for hours. Very cool tech. There’s other makers of this tech too. My endocrinologist says I’m on the “walmart” brand of the tech snd there’s a better maker out there.
Back to your question. The old version of the short-acting humulin insulin (humulin R) caused me to go into insulin shock much too regularly after age 30. It became a real problem. When I described the problem to my endocrinologist, he prescribed humalog. This was before its patent expired around 2013. I found immediate improvement.
Until age 30, I never got severe insulin shock with humulin R. But age takes its toll.
When he switched me to humalog, he also switched me to lantus (long acting). Previously, I took Humulin NPH for long acting. I never noticed a significant difference between lantus or humulin NPH.
At some point, my employer health insurance dropped lantus from its covered meds and my endocrinologist switched me to levemir for long acting.
In a pinch, I can buy some Humulin NPH (now it’s just Humulin N) without a prescription and still use it.
Now that I have the device and app, I’ve discovered I have the dawn effect and adjust my long acting insulin to try to counteract it.