Dendrobium aphyllum - when to stop watering?

[greenochre]

Hi, I'm an orchid newbie and this is my first Dendrobium.
I live in Barcelona, so I have high humidity, and the temperature inside in winter is about 21-23 Celsius during the day and about 15 Celsius at night.

I read that Dendrobium aphyllum has a dormant winter period which is necessary for it to flower in spring. But I'm a bit confused, because some sources say I should wait until it start dropping leaves, and then reduce or even eliminate watering until the new growth appears, and others say that I should reduce watering in December, and after reducing watering it will start dropping leaves.

So, what should be first? Should I reduce now or wait for the leaves to drop? It's growing a new leaf and some roots currently