Should you layer Greek yoghurt on porridge oats or mix it in with the porridge oats? I am experimenting with creating overnight oats with Greek yoghurt. However, I was not sure whether to layer the yoghurt on top of the oats with multiple layers of oats and yoghurt, or to mix in the yoghurt with the oats.

I was told by one person to layer the oats and yoghurt, but online tutorials seem to instruct you to mix the oats instead.

Should I layer or mix my yoghurt with the oats?

Are there any benefits of choosing one method over the other?
The point of overnight oats is to allow the oats time to hydrate slowly at a cool temperature, rather than cooking them in water. So it's best to have them well-mixed with the liquid they'll be absorbing. If you put them in (sufficiently thick) layers, it's likely that some of the oats will be less hydrated than others.