Although the name suggests it to be a night-invoking perfume, I find it extremely summer-like and full of light.
It starts off with a citrus splash of bergamot and tangerine, backed up with a feminine floral notes of jasmine, and a more masculine eau-de-cologne like notes of orange blossoms and a hint of musk, that adds sensuality to that blast of freshness.
As the top notes start to fade, they reveal a luscious fruity note of peach supported by vanilla, which gradually pushes away the dominant orange-blossom and tangerine accord.
The dry down gradually enters with an interesting and surprising accord dominated by a fresh, woody and masculine vetiver notes, accompanied by green notes, orange blossom (softer and more subtle now), and a very modest hint of vanilla and rose. 
This perfume is full of surprises, I love the way the stages fade into each other. The overall impression is of freshness and vivacity, mingled with a tad of melancholy, which brings to mind Chopin's expressive piano nocturni. 

It’s surprising to see that such an old-fashioned aldehydic floral was launched in the 80’s (1981 to be exact). The perfumer behind Nocturnes is Gerard Lefort.

Top notes: Aldehydes, Bergamot, Mandarin, Green notes
Heart notes: Orange Blossom, Jasmine, Ylang Ylang, Tuberose, Stephanotis, Lily of the Valley, Orris, Rose, Cyclamen 
Base notes: Vetiver, Musk, Sandalwood, Amber, Vanilla, Benzoin