I think you'd be OK using the oils as an overnight treatment. Natural oils like coconut, jojoba, avocado...and essential oils are easily absorbed by our skin so they do not cause any clogging. To clog your pores the oil would have to form a sort of plug, which these light oils do not do. In fact, that's what makes them unique, their ability to penetrate our hair and skin. And that's why they are popular in aromatheraphy - which isn't just about smells, but it calls for oils that can move through cell walls.