La Nuit is a very 1980's style fragrance; a tenacious, over the top, musty floral, leather, musk, patchouli, almost mess. It has reputation for being a dirty scent, which I don't agree with. It starts sweet and very loud and then passes on to a wonderful leather skin scent that stays around for quite a long time. It's reputation for being dirty probably comes from the fact that it smells like oily skin that has had make-up reapplied numerous times without being washed. I bet if you get it on your clothes, the smell will last a decade.
I just shared my bottle with a couple of fellow Basenoters that I am sure can give you a description with more note, by note finesse than I'm capable of.