I think this has to do with what type of edibles it is and how spread out it is through food.

For example, if I eat a large brownie with 10mg in it, that's going to basically have a time release effect if I don't eat some more food with it or after it. I've taken brownies before that didn't kick in until I had another snack or meal after. I think of it like pushing the edible through.

So yeah I'd imagine if you took an edible a few hours before bed, ate no additional food, you'd probably feel it in the morning still.

Tinctures seem to kick in fast no matter what I eat or drink after though.