In the US Southeast, culture has changed. After all, who really moves to the north to retire. Not long ago, there were 3 meals. Breakfast, dinner, and supper. Breakfast was mostly eggs, bacon, biscuits and gravy. Perhaps also grits or oatmeal. Something to "stick to your ribs". Dinner was the largest and longest meal. Supper was something as small a soup (soup-er = supper). The small meal was due to the farm community going to bed shortly after the sun goes down. That's early.
I find that a late night snack or a late supper gives me dreams. ...and they are not at all good. Nightmares mostly, even though I have a Native American dream catcher at the head of my bed.