Given how hard it is to track accurate nutritional data, I wonder if sleep research just as evasive to study since it is very difficult/expensive to define a “c

Given how hard it is to track accurate nutritional data, I wonder if sleep research just as evasive to study since it is very difficult/expensive to define a “control” group. I’d have to imagine you’d have to have subjects sleep alone in a controlled environment for a while before you could observe real patterns. This, we’re left with extreme cases to observe, not really normal ones.