Most women do this as we do with make up and fashion but the best advice is to stick a whole regime from one skin care house as each product will be produced to compliment the other. Sometimes you may find using a night cream as day cream or vice verse is appropriate for your skin and that’s fine.
However, if you are using prescription or cosmeceutical brands for exfoliating or resurfacing skin which contain ingredients like Retinol or glycolic acid, try to avoid using anything on top as it could neutralise the effect. Also doubling up on potent ingredients like these is a definite no no so always check ingredient labels as it could cause irritation.