After application, should I apply my night cream or not

This cream is your moisturizer. If you do feel like you need another moisturizer, try to wait for this one to dry down, then add. If I really want to get the best results of a product or evaluate it, I use it on its own for at least a week. That way you know for sure what's doing, and you're not diluting it with other products. This one is too expensive not to know for sure, and even with a line of products from the same brand, sometimes it's only one that's making a difference. This way you can figure it out.